KEMAMPUAN HIDUP DAN TUMBUH IKAN KEMURING, Striuntius lineatus (Duncker, 1904) ASAL PULAU BANGKA PADA TAHAP AWAL DOMESTIKASI

Ikan kemuring, Striuntius lineatus (Duncker, 1904), merupakan salah satu ikan lokal yang berpotensi untuk dikembangkan menjadi ikan hias. Ikan ini tergolong sulit didapatkan akibat rusaknya habitat oleh aktivitas manusia. Ikan ini merupakan ikan yang rentan stres dan mudah mengalami kematian. Domestikasi adalah salah satu upaya mencegah terjadinya kepunahan terhadap populasi spesies yang terancam siklus hidupnya. Penelitian ini bertujuan menguji kemampuan hidup dan performa pertumbuhan ikan kemuring dalam akuarium, serta mengetahui kualitas air yang mendukung pemeliharaan ikan kemuring. Penelitian ini menggunakan metode eksperimen. Data dianalisis secara deskriptif kuantitatif. Untuk melihat hubungan antara sintasan dengan kualitas air dianalisis menggunakan analisis PCA. Hasil penelitian menunjukkan bahwa ikan kemuring mampu hidup dan tumbuh pada wadah akuakultur. Nilai sintasan, pertumbuhan bobot mutlak, panjang mutlak, dan laju pertumbuhan spesifik masing-masing sebesar 93,33 ± 0,06%; 1,70 ± 0,31 g; 10,29 ± 1,02 mm; dan 0,96 ± 0,19% bobot tubuh/hari. Nilai suhu, pH, DO, TDS, TAN, dan kesadahan untuk pemeliharaan ikan kemuring didapatkan nilai masing-masing sebesar 28,72 ± 0,44°C; 6,28 ± 0,82; 5,81 ± 0,77 mg/L; 0,48 ± 0,16 mg/L; 2,50 ± 1,01 mg/L; dan 106,67 ± 55,73 mg/L. Berdasarkan analisis PCA, sintasan ikan kemuring di wadah pemeliharaan dipengaruhi oleh suhu, pH, DO, TAN, dan kesadahan.Lined barb is one of the local fish from Bangka Island that can be developed as a farmed ornamental fish. The fish is now rarely found in the wild due to its extensive habitat destruction by human activities. The fish is also relatively easy to get stressed and died. Domestication offers a solution to prevent the extinction of this fish population. Therefore, this study aimed to examine the survival and growth performance and determine the optimum rearing condition of lined barb in an aquarium setting. This research was carried out as an experimental study. The collected data were analyzed descriptively. The relationship between survival and water quality was determined using PCA analysis. The results showed that lined barbs were able to survive and grow in the aquaculture rearing media. The values of survival rate, absolute weight growth, absolute length, and specific growth rate were 93.33 ± 0.06%, 1.70 ± 0.31 g, 10.29 ± 1.02 mm, and 0.96 ± 0.19% body weight/day, respectively. The average values of temperature, pH, DO, TDS, TAN, and hardness were 28.72 ± 0.44°C, 6.28 ± 0.82, 5.81 ± 0.77 mg/L, 0.48 ± 0.16 mg/L, 2.50 ± 1.01 mg/L, 106.67 ± 55.73 mg/L, respectively. Based on the PCA analysis, the survival of lined barbs in aquaculture containers was influenced by temperature, pH, DO, TAN, and hardness of its rearing media.

PENGARUH PENGAYAAN Artemia sp. DENGAN SUMBER DHA YANG BERBEDA TERHADAP SINTASAN LARVA LOBSTER PASIR (Panulirus homarus)

Kegiatan pembenihan lobster masih dikembangkan di Indonesia. Sintasan yang rendah dan pakan yang sesuai masih menjadi masalah utama dalam kegiatan pembenihan lobster. Artemia sebagai pakan utama diduga belum mencukupi kebutuhan nutrisi larva lobster. Upaya pemberian bahan pengaya sebagai alternatif untuk meningkatkan nutrisi diharapkan dapat meningkatkan sintasan larva lobster. Pemberian bahan pengaya yang mengandung asam lemak dokosa heksanoid acid (DHA) ke Artemia dianggap penting bagi pertumbuhan dan sintasan pada krustasea. Tujuan penelitian ini untuk mengetahui performa larva lobster berdasarkan tingkat sintasan maupun perkembangan larva dengan pemberian pakan artemia yang diperkaya dengan DHA. Perlakuan yang diberikan meliputi Artemia yang baru menetas (A), Artemia yang diperkaya dengan plankton Isochrysis galbana strain Tahiti konsentrasi (1-1,5 x 106 sel/mL) (B), DHA selco dosis 0,6 g/L (C), dan Artemia inkubasi 18 jam tanpa pengayaan (D). Pemeliharaan larva dilakukan pada bak 100 L dengan sistem air stagnan. Perkembangan larva yang mampu dicapai pada semua perlakuan adalah stadia-IIIa. Pemberian Artemia yang diperkaya dengan DHA selco menunjukkan hasil sintasan yang lebih baik pada pemeliharaan enam hari pertama namun tidak memberikan pengaruh yang signifikan. Pada masa pemeliharaan sampai 20 hari terjadi penurunan sintasan (SR) mencapai hanya 1%. Hal ini disebabkan adanya bakteri dan protozoa seperti jenis protozoa Zoothamnium sp. dan bakteri berfilamen teramati menempel pada tubuh larva sehingga mengganggu pergerakan dan kemampuan larva dalam menangkap mangsa. Berdasarkan penelitian ini maka penggunaan pakan Artemia yang diperkaya DHA Selco dapat menjadi alternatif pakan larva lobster namun tetap diperlukan kontrol kualitas air yang baik.Efforts to culture spiny lobster, Panulirus homarus larvae are still being developed in Indonesia. One of the main challenges in lobster hatcheries is to find an appropriate feed and improving larval survival. Artemia has been used as the main feed and considered to have insufficient nutritional ingredient for lobster larvae. Enrichment of feed to improve its nutrient contents is expected to increase the larval survival. DHA-enriched feed is considered essential for growth and survival of crustaceans. The aim of this study was to determine the survival and development of larvae fed with DHA-enriched Artemia. The treatments consisted of newly hatched Artemia (A), enriched Artemia with phytoplankton, Isochrysis galbana strain Tahiti at a density of 1-1.5 x 106 cells/mL (B), enriched Artemia with DHA selco at a dose of 0.6 g/L (C), and Artemia incubated for 18 hours without DHA enrichment (D). Each Artemia enrichment was performed for 18 hours. Larval rearing was carried out in a 00 L tank with static water system. The achieved larval developmental stage in all treatments was stage-IIIa. Administration of enriched Artemia with DHA selco showed a better larval survival during the first six days of larval rearing. But, it did not give any significant effect. The survival was then decreased to only 1% on day-20. This was due to the presence of bacteria and protozoa which decreased water quality. Protozoa Zoothamnium sp. and filamentous bacteria were observed attaching to the body of the larvae, disrupting the movement and ability of larvae in capturing prey. Based on this research, the use of Artemia enriched with DHA selco as an alternative for lobster larvae feed, but better water quality control is still needed.

PERFORMA PERTUMBUHAN BENIH IKAN SEMAH (Tor douronensis) GENERASI PERTAMA DENGAN PADAT TEBAR BERBEDA DI KARAMBA JARING APUNG

Ikan semah (Tor douronensis) termasuk salah satu spesies dari genus Tor yang memiliki nilai ekonomis tinggi. Untuk meningkatkan produktivitas, informasi pertumbuhan benih yang dipelihara pada sistem budidaya karamba jaring apung (KJA) perlu dilakukan karena ikan semah umumnya dibudidayakan pada kolam dengan air yang jernih. Penelitian ini bertujuan untuk mendapatkan informasi laju pertumbuhan benih ikan semah generasi pertama dengan perlakuan padat tebar yang berbeda pada sistem pemeliharaan KJA. Percobaan dilakukan di Waduk Cirata, Cianjur, Jawa Barat selama lima bulan. Ikan uji (panjang total: 7-8 cm; bobot: 5-6 g) dipelihara di KJA (padat tebar 50, 75, dan 100 ekor/m3 dengan tiga kali ulangan). Pakan apung komersial dengan kadar protein 40% diberikan sebesar 6% per biomassa yang diberikan dua kali sehari. Parameter yang diamati yaitu pertumbuhan bobot mutlak, sintasan, laju pertumbuhan spesifik (SGR), dan biomassa. Hasil percobaan menunjukkan bahwa perlakuan padat tebar 50 ekor/m3 menghasilkan pertumbuhan terbaik dengan bobot akhir 15,89 ± 1,43 g; pertambahan mutlak 10,48 ± 1,41 g; sintasan 94,67 ± 4,6%; dan SGR 0,75 ± 0,04%. Dari hasil penelitian ini, padat tebar 50 ekor/m3 merupakan kondisi yang terbaik untuk pemeliharaan benih ikan semah di KJA. Hasil penelitian ini dapat dijadikan informasi awal tentang potensi budidaya ikan semah dengan sistem budidaya KJA perlu dikembangkan di masa yang akan datang.Semah mahseer (Tor douronensis) is a species from the genus Tor and highly valued in local and national markets. Nevertheless, the fish production from net cage is currently limited. In order to increase its productivity, research on the growth of semah mahseer fingerlings reared in floating net cage systems needs to be carried out as this species is predominantly cultured in the clean water ponds. This study was conducted to obtain information on the growth performance of the first generation of semah mahseer fingerlings reared with different stocking densities in a floating net cage system. The experiment was carried out in the floating net cage located at Cirata Reservoir, Cianjur, West Java, for five months. Fingerlings (total length: 7-8 cm; body weight: 5-6 g) were reared in the floating net cage (stocking density of 50, 75, and 100 ind./m3 with three replications). The fish were fed with a commercial diet (protein content of 40%) given at 6% of biomass twice a day. The parameters observed included weight gain, survival rate, specific growth rate (SGR), and biomass. The results showed that the stocking density of 50 ind./m3 had the best performance in terms of final weight of 15.89 ± 1.43 g, weight gain of 10.48 ± 1.41 g, survival rate of 94.67 ± 4.6%, and specific growth rate of 0.75 ± 0.04%. Based to the results of this study, the stocking density of 50 ind./m3 is the best condition for rearing semah mahseer fingerlings in floating net cages. The findings of this research can be used as the basic information for future aquaculture development of semah mahseer in net cages.

KERAGAAN BIOREPRODUKSI TIGA GENERASI IKAN TAMBAKAN (Helostoma temminckii Cuvier, 1829)

Ikan tambakan merupakan ikan lokal yang potensial menjadi ikan budidaya. Salah satu proses penting dalam budidaya adalah aspek reproduksi. Penelitian untuk mengetahui karakteristik bioreproduksi tiga generasi ikan tambakan hasil kegiatan domes‘tikasi di Balai Riset Perikanan Budidaya Air Tawar dan Penyuluhan Perikanan, Bogor. Pengujian dilakukan untuk mengetahui posisi gonad, fekunditas, derajat pembuahan, dan derajat penetasan ikan tambakan generasi yang berbeda. Hasil yang diperoleh menunjukkan posisi gonad vertikal mengarah ke tulang belakang, di bagian ujung melengkung ke arah depan dan gonad berada di belakang urogenital. Fekunditas telur/gram bobot ikan yang dihasilkan tidak berbeda antar generasi dengan jumlah berkisar antara 76 ± 13 sampai 83 ± 14 butir. Persentase telur terbuahi dan telur menetas antar generasi juga tidak berbeda, masing-masing berkisar antara antara 70,6 ± 16,05 sampai 92,9 ± 10,88%; dan 51,3 ± 16,64 sampai 74,3 ± 10,32%. Jumlah larva yang dihasilkan juga tidak berbeda nyata antar generasi, berurutan dari yang kecil ke besar G-0 (38,7 ± 10,72 butir/g bobot ikan), G-1 (45,3 ± 5,20 butir/g bobot ikan), dan G-2 (55,7 ± 7,75 butir/g bobot ikan). Program domestikasi ikan tambakan tidak mempengaruhi karakter reproduksi ikan antar generasi. Keragaman karakter reproduksi antar generasi masih tinggi. Pembentukan generasi selanjutnya perlu dipertahankan, sehingga dapat digunakan sebagai ikan budidaya baru.Kissing gourami is an Indonesian local fish species that has the potential to be developed as a farmed fish. However, the current domestication stage of the fish still requires further information regarding its bio reproduction. The research on determining the bioreproductive characteristics of three generations of kissing gourami has been carried out at the Research Institute of Freshwater Aquaculture and Fisheries Extensions, Bogor. This research aimed to determine the gonad position, gonad maturity index, and fecundity between the kissing gourami generations. The results showed that the gonads were positioned vertically towards the backbone, curved ends towards the front and located behind the urogenital. The fecundity of produced eggs/gram body weight of fish did not differ between generations and ranged between 76 ± 13–83 ± 14 eggs. The percentages of fertilized eggs and hatched eggs between generations did not differ and ranged between 70.6 ± 16.05–92.9 ± 10.88% and 51.3 ± 16.64–74.3 ± 10.32%, respectively. The number of produced larvae was also not significantly different between generations where G-0 has the lowest number (38.7 ± 10.72 eggs/g fish weight), followed by G-1 (45.3 ± 5.20 eggs/g fish weight) and G-2 has the highest number of produced larvae (55.7 ± 7.75 eggs/g fish weight). The aquaculture domestication program does not affect the reproductive character of fish between generations. The diversity of reproductive characters between generations is still high. The formation of the next generation needs to be maintained, so that it can be used as a new cultured fish.

PERKEMBANGAN JUMLAH EKTOPARASIT Pseudorhabdosynochus spp. PADA INSANG KERAPU HIBRIDA CANTIK (Epinephelus fuscoguttatus x E. polyphekadion) MELALUI METODE KOHABITASI

Genus Pseudorhabdosynocus merupakan Monogenea yang sering menginfeksi ikan kerapu. Pengaruh perbedaan jarak antara ikan sakit dengan ikan sehat terhadap perkembangan jumlah Pseudorhabdosynochus spp. pada ikan kerapu hibrida “cantik” dipelajari dalam penelitian ini melalui metode kohabitasi. Kohabitasi dilakukan dengan dua metode yaitu (a) menempatkan lima ekor ikan sakit ke dalam keranjang dengan jarak 25 cm dari dasar bak, dan (b) menempatkan lima ekor ikan sakit ke dalam keranjang dengan jarak 10 cm dari dasar bak. Kedua keranjang tersebut diapungkan ke dalam bak plastik berbeda dengan volume 100 L air laut (33 ppt) yang masing-masing telah berisi 30 ekor ikan kerapu hibrida “cantik” sehat. Masing-masing lima ekor ikan dari kedua metode kohabitasi diambil pada hari ke-2, 4, 6, 8, 10, dan 15 pemeliharaan. Hasil penelitian menunjukkan bahwa infeksi buatan menggunakan metode kohabitasi (b) lebih cepat menyebarkan Pseudorhabdosynochus spp. dari ikan sakit ke ikan sehat dibandingkan dengan metode kohabitasi (a). Perkembangan populasi Pseudorhabdosynochus spp. dan telurnya pada metode kohabitasi (b) lebih tinggi yaitu 1.495 ± 206,3 ekor/ikan dan 18,6 ± 3,8 telur/ikan dibandingkan dengan metode kohabitasi (a) yaitu 163,2 ± 16,3 ekor/ikan dan 3,8 ± 0,7 telur/ikan pasca 15 hari kohabitasi. Secara histopatologi, lamela insang yang terinfeksi Pseudorhabdosynochus spp. menunjukkan adanya hyperplasia epitel sel filamen insang yang menimbulkan fusi filamen. Kerusakan filamen di hampir semua lamela insang menyebabkan terganggunya sistem pernapasan ikan kerapu. Hasil tersebut dapat disimpulkan bahwa penyebaran Pseudorhabdosynochus spp. semakin cepat dengan semakin dekat jarak kontak antara ikan sakit dengan ikan sehat.Pseudorhabdosynocus is a genus of Monogenea that frequently infect grouper fish. This study aimed to observe the changes of density patterns of Pseudorhabdosynochus spp. in hybrid grouper gill through cohabitation. Two cohabitation methods were applied to understand the effects of distance between sick and healthy fish in terms of parasite infection. The cohabitation methos were arranged as follows: (a) five fish infected with Pseudorhabdosynochus spp. were placed into a basket at a distance of 25 cm from the bottom of the tank, and (b) five fish infected with Pseudorhabdosynochus spp. were placed into a basket at a distance of 10 cm from the bottom of the tank. The two baskets were floated into different plastic tanks of 100 L of seawater (33 ppt), each of which contained 30 healthy hybrid groupers. Each of the five fish from the two cohabitation methods was sampled on day 2, 4, 6, 8, 10, and 15 after cohabitation. The results showed that the spread of Pseudorhabdosynochus spp. from sick fish to healthy fish with the cohabitation method b was faster than the cohabitation method a. The development number of Pseudorhabdosynochus spp. and its eggs in the cohabitation method b were higher, reaching 1,495 ± 206.3 parasite/fish and 18.6 ± 3.8 eggs/fish than the cohabitation method a, 163.2 ± 16.3 parasite/fish and 3.8 ± 0.7 eggs/fish after 15 days of cohabitation. Histopathologically, gill lamella infected with Pseudorhabdosynochus spp. showed the presence of epithelial hyperplasia of gill filament cells causing fusion. Damage of the gill filament in all of gill lamella has caused disruption of the grouper breathing system. From these findings, it can be concluded that the spread of Pseudorhabdosynochus spp. was faster if the distance of direct contact between sick and healthy fish was closer.

PERFORMA BUDIDAYA UDANG WINDU (Penaeus monodon) PADA MUSIM KEMARAU DI TAMBAK KECAMATAN MARUSU KABUPATEN MAROS

Salah satu program dari Gubernur Sulawesi Selatan periode 2018-2023 adalah mengembalikan kejayaan udang windu di Sulawesi Selatan. Telah dilakukan kegiatan yang bertujuan mengetahui performa budidaya udang windu di tambak pembudidaya yang dilaksanakan pada musim kemarau tahun 2019 di Kecamatan Marusu Kabupaten Maros. Kegiatan budidaya udang windu teknologi tradisional plus dilaksanakan di tambak Dusun Kurilompo, Desa Nisombalia Kecamatan Marusu Kabupaten Maros. Sebanyak enam petak tambak pembudidaya ditebari tokolan udang windu dengan padat penebaran dari 10.000 sampai 30.000 ekor/ha. Setelah dipelihara selama 69 sampai 80 hari dilakukan panen dan selanjutnya dilakukan penentuan sintasan, bobot rata-rata, produksi udang windu, dan rasio konversi pakan (RKP). Data yang diperoleh dianalisis secara deskriptif. Hasil kegiatan menunjukkan bahwa kualitas air di tambak Kecamatan Marusu, Kabupaten Maros pada musim kemarau dicirikan dengan salinitas yang berkisar antara 36,63-69,40 ppt; suatu kondisi yang tidak optimal untuk budidaya udang windu. Pada saat panen didapatkan sintasan udang windu dari 27,57% sampai 66,67%; bobot rata-rata dari 14,29-40,00 g/ekor; produksi dari 90,1-800,0 kg/ha/musim; dan RKP dari 0,54:1 sampai 2,10:1. Disimpulkan bahwa budidaya udang windu di tambak bersalinitas tinggi di daerah ini merupakan penyebab utama rendahnya sintasan, bobot rata-rata, produksi udang windu, dan RKP. Direkomendasikan bahwa perbaikan budidaya udang dengan menjaga tingkat salinitas dalam nilai optimal harus disosialisasikan kepada pembudidaya udang windu di daerah tersebut.One of the main aquaculture development targeted by the South Sulawesi Province for the period 2018-2023 is to restore the glory of tiger shrimp farming in South Sulawesi. The recent study was carried out to uncover redevelopment opportunities of tiger shrimp culture and determine the performance of tiger shrimp culture in the farmers’ ponds. The study was performed during the dry season in Marusu Subdistrict Maros District, in 2019. Traditional plus tiger shrimp farming activities were carried out in the ponds of Kurilompo Subvillage, Nisombalia Village, Marusu Subdistrict, Maros District. A total of six brackishwater ponds were stocked with tiger shrimp fingerling with stocking densities of 10,000-30,000 ind./ha. After being cultured for 69 to 80 days, the shrimp were harvested and measured their survival rate, average weight, production of tiger shrimp, and feed conversion ratio (FCR). The data obtained were analyzed with descriptive statistics. The results showed that water quality in brackishwater ponds of Marusu Subdstrict Maros District, in the dry season is characterized by salinity ranging from 36.63 to 69.40 ppt, a condition that is not optimal for tiger shrimp culture. At harvest, the survival rate, average weight, production, and FCR of the farmed average tiger shrimp were 27.57%-66.67%, 14.29-40.00 g/ind., 90.1-800.0 kg/ha/season, and 0.54:1-2.10:1, respectively. It is concluded that the culture of tiger shrimp in the brackishwater ponds with high salinity in this area is the primary cause of poor survival rate, average weight, production of tiger shrimp, and FCR. It is recommended that culture shrimp improvement via maintaining salinity level within the optimal values has to be disseminated to the fish farmers in the area.

KERAGAAN PERTUMBUHAN IKAN TAMBAKAN (Helostoma temminckii Cuvier, 1829) DENGAN KEPADATAN BERBEDA

Padat tebar merupakan salah satu faktor yang berpengaruh terhadap keragaan pertumbuhan dalam budidaya ikan. Penelitian ini dilakukan untuk mengetahui kepadatan optimum untuk pertumbuhan ikan tambakan. Penelitian ini dilakukan di Instalasi Riset Plasma Nutfah Perikanan Air Tawar, Cijeruk, Balai Riset Perikanan Budidaya Air Tawar dan Penyuluhan Perikanan (BRPBATPP), Bogor. Ikan tambakan generasi ke-2 dengan panjang total 2,10 ± 0,18 cm dan bobot 4,83 ± 0,17 g yang diperoleh melalui program domestikasi dipelihara di kolam bak beton yang diberi sekat (ukuran 3 m x 3,5 m x 1 m). Pakan komersial berupa pelet terapung (protein 39%-41%; lemak 5%) diberikan sebanyak 3% per hari dari biomassa dengan frekuensi pemberian sebanyak tiga kali. Perlakuan kepadatan yang dilakukan pada penelitian adalah 25, 50, dan 75 ekor/m2 dengan tiga ulangan. Pengambilan data dilakukan setiap 30 hari sebanyak 30 ekor dari setiap ulangan selama 150 hari masa pemeliharaan terhadap panjang, bobot, kelangsungan hidup, biomassa, dan rasio konversi pakan. Pengukuran kualitas air juga dilakukan sebagai data pendukung. Hasil penelitian menunjukkan bahwa pertumbuhan panjang baku, panjang total, bobot, dan sintasan tertinggi diperoleh pada kepadatan 25 ekor/m2.Stocking density is one of the influencing growth performance indicators in aquaculture. This study was conducted to determine the optimum stocking density in optimizing the growth rate of kissing gourami. The study was carried out at the Research Station for Freshwater Fisheries Germplasm, Cijeruk, RIFAFE Bogor. A second generation of kissing gourami with total length of 2.10 ± 0.18 cm and body weight of 4.83 ± 0.17 g produced from a domestication program were reared in separated-nets concrete ponds (pond division: 3 m x 3,5 m x 1 m) and fed using commercial floating pellets (protein: 39%-41%; lipid: 5%). Feed was given 3% of biomass per day with a feeding frequency of three times per day. Stocking density treatments in this study were 25, 50, and 75 fish/m2 with three replications. Data collection was conducted every 30 days from 30 fish in each replicate during 150 days of rearing period on growth parameters including length, weight, survival rate, biomass, and feed conversion ratio. Water quality measurement was also conducted as supplementary data. The results showed that the highest values on standard length gain, absolute length gain, weight gain, and survival rate were found in the fish population with a stocking density of 25 fish/m2.

APLIKASI ASTAXANTHIN DARI HAEMATOCOCCUS PADA BENIH KERAPU SUNU (Plectropomus leopardus) TERHADAP TOTAL KAROTENOID DAN PROFIL DARAH

Haematococcus merupakan alga yang kaya karotenoid dari jenis astaxanthin yang tidak hanya berpotensi sebagai sumber pigmen merah tetapi juga sebagai antioksidan. Aplikasi haematococcus telah dilakukan pada larva kerapu sunu dan menunjukkan adanya perbaikan peformansi warna merah yang cukup signifikan. Tujuan dari penelitian ini adalah mengetahui pengaruh haematococcus sebagai sumber astaxanthin terhadap pertumbuhan, total karotenoid, dan profil darah (hematokrit dan haemoglobin) pada juvenil ikan kerapu sunu. Benih kerapu sunu ukuran panjang rata-rata 14,07 ± 0,07 cm dan bobot rata-rata 45,92 ± 6,35 g dipelihara dalam jarring berukuran 0,5 m x 0,5 m x 1 m yang diletakkan dalam bak beton ukuran 3 m x 1,2 m x 1,2 m. Kepadatan ikan tiap jaring adalah lima ekor. Perlakuan yang diujicobakan adalah penambahan haematococcus ke dalam pakan buatan dengan dosis dan kompisisi sebagai berikut: A) 1% dari berat pakan, B) 1% dari berat pakan + 10% minyak ikan, dan C) 0% (kontrol). Hasil penelitian menunjukkan bahwa penambahan haematococcus ke dalam pakan tidak memberikan perbedaan nyata terhadap pertumbuhan mutlak panjang dan bobot, serta laju pertambahan panjang dan bobot (P value > 0,05). Penambahan haematococcus memberikan perbedaan nyata (P value < 0,05) terhadap konversi pakan di mana perlakuan A (1,99 ± 0,09); B (2,12 ± 0,14); dan C (2,28 ± 0,09). Penambahan haematococcus memberikan peningkatan terhadap akumulasi kandungan total karoten, hematocrit, dan haemoglobin darah.Haematococcus, an alga rich in carotenoids of the astaxanthin type, not only has the potential as a source of red pigment but also as an antioxidant. The purpose of this study was to determine the effects of hematococcus as astaxanthin source on the growth, total carotenoids, and blood profile (hematocrit and hemoglobin) of coral trout grouper juvenile. Coral trout grouper seed with an average length of 14.07± 0.07 cm and an average weight of 45.92 ± 6.35 g were maintained in a net cage measuring 0.5 m x 0.5 m x 1 m placed in a 3 m x 1.2 m x 1.2 m concrete tank. Fish density per net was five fish. The treatment tested was the addition of haematococcus into the artificial feed with the following dosages and compositions: A) 1% of the weight feed, B) 1% of the weight feed + 10% fish oil, C) 0% (control). The results showed that the addition of haematococcus to the feed did not give a significant difference to the absolute growth of length and weight and also specific growth and length rate (P-value > 0.05). The addition of haematococcus gave a significant difference (P-value < 0.05) to feed conversion ratio between treatment A, B and C with the values of 1.99 ± 0.09, 2.12 ± 0.14, and 2.28 ± 0.09, respectively. The addition of haematococcus also increased the levels of total carotene content, hematocrit, and hemoglobin. This study suggests that the application of haematococcus could significantly improve the red color performance of trout grouper larvae.

STUDI KOMPARATIF EFEK PENGGUNAAN PAKAN MANDIRI DAN PAKAN KOMERSIAL DALAM BUDIDAYA IKAN NILA SRIKANDI (Oreochromis aureus x O. niloticus) DI KABUPATEN BREBES, JAWA TENGAH

Penelitian ini bertujuan mengevaluasi penggunaan pakan mandiri dan pakan komersil untuk pakan ikan nila srikandi di Brebes, Jawa Tengah. Pemeliharaan ikan nila srikandi dilakukan menggunakan tambak yang berukuran ± 3.000 m2 sebanyak tiga unit di mana setiap petak tambak disekat menjadi dua sehingga terdapat enam unit petak percobaan. Setiap unit percobaan ditebar sebanyak 10.000 ekor benih ikan. Ikan nila srikandi dipelihara selama empat bulan dan diberi pakan harian sebanyak 1%-2% dari bobot tubuh pada pukul 07.00, 12.00, dan 17.00. Ikan diberi pakan uji pada bulan ke-1 dan ke-2 sebanyak 1% dari bobot tubuh, kemudian pemberian pakan ditingkatkan menjadi 2% pada pemeliharaan bulan ke-3 dan ke-4. Performa ikan nila srikandi (pertumbuhan, laju pertumbuhan, dan kelangsungan hidup) yang diberi pakan mandiri dan pakan komersil diuji dengan menggunakan uji-T. Hasil penelitian menunjukkan bahwa pertumbuhan ikan nila srikandi tidak berbeda nyata antara yang diberi pakan pakan mandiri dengan yang diberi pakan komersil (P>0,05). Kemudian, hasil produksi ikan nila srikandi yang diberi pakan mandiri mencapai 2.214 ± 172,69 kg dan pakan komersil 2.248,5 ± 234,85 kg. Berdasarkan hasil analisis usaha penggunaan pakan mandiri pada budidaya nila srikandi lebih direkomendasikan dibandingkan dengan pakan komersil.The purpose of this study was to determine the effects of locally-produced and commercial feeds on the growth of Srikandi tilapia cultured in fish farming areas of Brebes Regency, Central Java. Tilapia Srikandi were cultured in three ponds sized approximately ± 3,000 m2. Each pond was divided into two sections divided by a net, which resulted in six experimental plots. Each experimental plot was stocked with 10,000 fish seeds. Srikandi tilapia were maintained for four months and given daily feed as much as 1%-2% of body weight with feeding time at 07.00, 12.00, and 17.00. The fish were given test feeds in the 1st and 2nd month as much as 1% of body weight. The feeding level was increased to 2% in the 3rd and 4th months. The performances of Srikandi tilapia (growth, growth rate, and survival) fed with the two feed types were tested using the T-test. The results showed that there was no statistically significant difference on growth performance between fish fed with locally-produced feed and commercial feed (P>0.05). The total harvest of Srikandi tilapia fed with the locally produced feed reached 2,214 ± 172.69 kg and 2,248.5 ± 234.85 kg for the commercial feed. This study suggests that in terms of economic efficiency, the use of the locally-produced feed in Srikandi tilapia farming is more profitable compared to the use of commercial feed.

TINGKAT KESUBURAN DAN POTENSI PRODUKSI UDANG VANAME DI TAMBAK UPT PERIKANAN AIR PAYAU DAN LAUT PROBOLINGGO

Keberlanjutan kegiatan pertambakan sangat tergantung pada kondisi kualitas lingkungan perairan dalam mendukung potensi produksi biota budidaya. Namun, dalam pengelolaan juga perlu diketahui potensi lingkungan dalam memproduksi biota. Penelitian ini bertujuan untuk mengukur tingkat kesuburan perairan pada tambak serta mengestimasi produksi udang yang dihasilkan dengan pendekatan Produktivitas Primer. Penelitian dilakukan di tambak UPT Probolinggo, Fakultas Perikanan dan Ilmu Keluatan, Universitas Brawijaya. Analisis kesuburan perairan tambak dilakukan menggunakan metode Tropic State Index (TSI), dan pendugaan produksi udang dengan pendekatan metode Beveridge dengan mengkonversi nilai Produktivitas Primer, dimana nilai Produktivitas Primer dapat dihitung dengan mentransformasi nilai Klorofil-a. Rata-rata hasil pengukuran klorofil-a pada tambak 1 sebesar 23,06 mg/m3 dan pada tambak 2 sebesar 20,62 mg/m3. Tingkat kesuburan pada kedua tambak menunjukkan perairan eutrofik sedang. Rata-rata potensi produksi udang pada tambak 1 adalah 13,22 ton C-udang/2700m2/tahun; dan tambak 2 adalah 10,90 ton C-udang/2700m2/tahun. Korelasi antara nilai klorofil-a dan estimasi produksi udang menunjukkan nilai korelasi < 0,199 yang artinya keeratan kedua variabel sangat rendah. Namun korelasi antara klorofil-a dan PP memiliki hubungan yang sangat kuat yaitu > 0,99. The sustainability of aquaculture activities highly depends on the water quality conditions of the aquatic environment. Thus, determining the existing environmental condition of fish culture followed by regular monitoring is necessary to ensure the optimum production of farmed fish. The purpose of this current research was to determine the eutrophication level in shrimp ponds and estimate its shrimp production using the approach of Primary Productivity. The study was conducted in the shrimp ponds managed by the Probolinggo Technical Extension Office, Faculty of Fisheries and Marine Science, Brawijaya University. The eutrophication level was determined used the Tropic State Index (TSI) method. Shrimp production was estimated using the Beveridge Method by which the primary productivity values were calculated by transforming the Chlorophyll-a values. The results showed that the average contents of chlorophyll-a in pond 1 and pond 2 were 23.06 mg.m-3 and 20.62 mg.m-3, respectively. The eutrophication levels in both ponds indicate moderate eutrophic water. The estimated shrimp productions in ponds 1 and 2 were 13.22 and 10.90 tons C-shrimp 2700m-2 year-1, respectively. The correlation value between the chlorophyll-a levels and estimated shrimp productions was <0.199 which means that the relationship between the two variables is unsubtantial. On the other hand, the chlorophyll-a and primary productivity had a very strong relationship indicated by the correlation value of > 0.99.