scholarly journals DISTRIBUSI FREKUENSI PANJANG, HUBUNGAN PANJANG TUBUH, PANJANG KLASPER, DAN NISBAH KELAMIN CUCUT LANJAMAN (Carcharhinus falciformis)

2017 ◽  
Vol 13 (3) ◽  
pp. 243 ◽  
Author(s):  
Dharmadi Dharmadi ◽  
Fahmi Fahmi ◽  
Mohammad Adrim
Keyword(s):  
Sex Ratio ◽  
Fishing Gear ◽  
Length Frequency ◽  
Total Length ◽  
Gill Net ◽  
Long Line ◽  
The Family ◽  
Landing Sites ◽  
Silky Shark ◽  
The Indian Ocean

Cucut lanjaman (C. falciformis) merupakan salah satu jenis cucut dari famili Carcharhinidae yang umum tertangkap di perairan Samudera Hindia dengan alat tangkap rawai cucut, rawai tuna, dan jaring insang tuna. Penelitian ini dilakukan pada bulan April 2001 sampai dengan Desember 2004 di beberapa tempat pendaratan ikan dan pasar ikan di Pelabuhanratu, Cilacap, Kedonganan-Bali, dan Tanjung Luar-Lombok. Hasil penelitian menunjukkan bahwa hubungan antara panjang total dengan panjang klasper terlihat eksponensial, dengan nilai R2=0,8218 (untuk klasper yang belum berisi zat kapur), dan nilai R2=0,8197 (untuk klasper yang sebagian berisi zat kapur), dan linier dengan nilai R2=0,7529 (untuk klasper yang penuh dengan zat kapur). Korelasi antara panjang klasper dengan panjang total tubuh cucut semakin kecil dengan semakin bertambah zat kapur dalam klasper. Frekuensi panjang terendah pada cucut lanjaman betina antara 51 sampai dengan 60 cm dan 241 sampai dengan 250 cm dan frekuensi panjang tertinggi antara 181 sampai dengan 190 cm. Pada cucut lanjaman jantan, frekuensi panjang terendah 251 sampai dengan 260 cm dan tertinggi antara 181 sampai dengan 190 cm. Sedangkan nisbah kelamin jantan dan betina cucut lanjaman mendekati 1:1 (51:49%). Nilai perbandingan nisbah kelamin suatu spesies dapat disebabkan oleh ketersediaan ikan dan selektivitas alat tangkap. Silky shark (C. falciformis) is one of the family Carcharhinidae community caught by shark longlin from, drift tuna long line and drift gill net in the Indian Ocean. This study was conducted between April 2001 to December 2004 at some fish landing sites an or fish market i.e. Palabuhanratu, Cilacap, Kedonganan-Bali, and Tanjung Luar Lombok. Results showed relationship between total length and clasper length was exponential (R2=0.8218), for not calcification clasper, and (R2=0.8197) for not full calcification clasper, and linier (R2=0.7529) for full calcification claspe . The correlation of clasper length and total length of silky shark tend to be smaller with in creasing calcificated content and clasper. The lowest length frequency of female silky shark was 51 to 60 cm and 241 to 250 cm, and the highest length frequency was 181 to 190 cm. Lowest length frequency of male silky shark was 251 to 260 cm and the highest was 181 to 190 cm. While sex ratio of male and female was mostly 1:1 (51: 49%). Variation of sex ratio occured due to the availability of fish and the selectivity of the fishing gear.

scholarly journals KOMPOSISI DAN FLUKTUASI HASIL TANGKAPAN IKAN CUCUT DOMINAN YANG TERTANGKAP RAWAI TUNA PERMUKAAN

2017 ◽  
Vol 14 (4) ◽  
pp. 371
Author(s):  
Dharmadi Dharmadi ◽  
Suprapto Suprapto ◽  
Agustinus Anung Widodo
Keyword(s):  
Indian Ocean ◽  
Total Catch ◽  
Fishing Activity ◽  
Prionace Glauca ◽  
Long Line ◽  
Landing Sites ◽  
Silky Shark ◽  
The Indian Ocean ◽  
Carcharhinus Falciformis ◽  
Catch Composition

Perikanan rawai tuna memiliki kontribusi cukup besar terhadap hasil tangkapan ikan cucut (Requiem shark sp.) di perairan Samudera Hindia. Hasil tangkapan rawai tuna sebagian besar didaratkan di 2 pendaratan ikan utama yaitu Pelabuhan Perikanan Pelabuhan Ratu dan Pelabuhan Perikanan Samudera Cilacap. Kegiatan penelitian untuk mengetahui komposisi dan fluktuasi hasil tangkapan ikan cucut (Requiem shark sp.) dominan pada rawai tuna permukaan berbasis di 2 lokasi pendaratan ikan tersebut dilakukan pada tahun 2004. Hasil penelitian menunjukkan bahwa komposisi hasil tangkapan cucut (Requiem shark sp.) pada rawai tuna permukaan didominansi oleh jenis ikan cucut karet atau selendang (Prionace glauca) antara 40 sampai dengan 90%, sedangkan komposisi jenis ikan cucut lain seperti ikan cucut lanjaman (Carcharhinus falciformis dan Carcharhinus sorrah), cucut paitan (Alopias superciliosus), cucut tikusan (Alopias pelagicus), dan cucut mako (Isurus sp.) antara 3 sampai dengan 30%. Hasil tangkapan ikan cucut (Requiem shark sp.) terhadap hasil tangkapan total rawai tuna permukaan antara 5 sampai dengan 25% pada tahun 2004 dari rata-rata 85 unit kapal rawai tuna yang beroperasi di perairan Samudera Hindia. Hasil tangkapan ikan cucut (Requiem shark sp.) tertinggi terjadi pada bulan Juli sampai dengan Agustus. Hasil tangkapan ini berkaitan dengan kondisi cuaca (Requiem shark sp.) pada saat nelayan melakukan penangkapan ikan di laut. Tuna long lines fisheries have more contributed on the catch of shark (Requiem shark sp.) in the Indian Ocean. Most of catch from tuna long lines landed at two main landing sites of tuna long line which operated in the Indian Ocean were Pelabuhan Ratu and Cilacap. This study was conducted at that two landing sites during 2004. The result showed that shark (Requiemshark sp.) catch composition on tuna long line was dominated by blue shark, Prionace glauca (40 to 90%), while other sharks i.e. silky shark (Carcharhinus falciformis), spot tail shark (Carcharhinus sorrah), big eye thresher (Alopias superciliosus), pelagic thresher (Alopias pelagicus), and mako shark (Isurus sp.) between 3 to 30% from the total catch of shark (Requiem shark sp.). Percentage catch of sharks (Requiem shark sp.) againts total catch of tuna surface long line during 2004 was ranging 5 to 25% from everage of 85 unit of tuna long line boat that operated in the Indian Ocean. Catch fluctuation related with the weather conditon when the fishers are fishing activity at sea. The high catch of shark (Requiem shark sp.) was occur on July until August.

scholarly journals Population structure and reproductive characteristics of the silky shark Carcharhinus falciformis (Müller & Henle, 1839) (Carcharhiniformes: Carcharhinidae) off the coast of Oaxaca, Mexico

2017 ◽  
Vol 44 (3) ◽  
pp. 513-524
Author(s):  
María del Carmen Alejo-Plata ◽  
Miguel Ángel Ahumada-Sempoal ◽  
José Luis Gómez-Márquez ◽  
Adrián González-Acosta
Keyword(s):  
Population Structure ◽  
Sex Ratio ◽  
Seasonal Changes ◽  
Sexual Maturity ◽  
Size Structure ◽  
Landing Sites ◽  
Silky Shark ◽  
Oceanic Species ◽  
Carcharhinus Falciformis ◽  
Gravid Females

Carcharhinus falciformis is an abundant oceanic species, which occurs in equatorial and tropical zones, with an important catch in the Atlantic and Pacific coasts of Mexico. Samples were taken from December 2000 to December 2007 in four landing sites of the artisanal fleet on the coast of Oaxaca. During the period of study 1236 specimens (602 females and 634 males) of C. falciformis were registered. Total length (TL) ranged from 49 to 217 cm for females (mean = 111.3 cm) and from 59 to 265 cm for males (mean = 111.7 cm). The sex ratio of females to males was 1:1 ( 2 0.05 = 0.78, P > 0.05). The present data suggest a size at first sexual maturity of about 184.8 cm TL for females and 178.5 cm TL for males. The catches were composed mainly of young. In the 52 gravid females examined, the average number of embryos per female was seven; with a range of 3-14 embryos. Mean TL of embryos ranged from 10 to 66 cm with evidence of seasonal changes in the size structure. Results obtained showed that C. falciformis gives birth most of the year, with the highest proportion of births during the rainy season (May to October).

scholarly journals INVENTORY OF FISHING GEAR IN KECAMATAN TUNGKAL ILIR, TANJUNG JABUNG BARAT, JAMBI

AQUASAINS ◽  
2018 ◽  
Vol 6 (2) ◽  
pp. 615
Author(s):  
Lisna Lisna ◽  
Agnes Vincentia ◽  
Noferdiman Noferdiman ◽  
Jasmine Masyitha Amelia
Keyword(s):  
Data Collection ◽  
Fishing Gear ◽  
Gill Net ◽  
Long Line ◽  
Fishing Area

This research was conducted at Tungkal Ilir, Jambi on May to July 2017. The aims of this study were (1) to determine the types of fishing gear that operates in Tungkal Ilir, (2) fishing area and (3) the dynamics of operating fishing gear in Tungkal Ilir. Data collection was done by interview and observation. The data will be analyzed descriptively using tables and graphs. Based on the results of this research, the fishing gear used in Tungkal Ilir are gill net, trawl, togok, sondong, trap and long line. Gill net is the largest fishing gear used with 15 fishermen. While the least used fishing gear is trap. The dynamics of fishing is strongly influenced by the season and the type of fishing gear used by the fisherman. The fishing area in Tungkal Ilir ranges from 1 mile to 30 miles

scholarly journals Biology characteristic, abundance index and fishing aspect of donkey croaker (Pennahia anea Bloch, 1793) in the Tangerang Waters

2020 ◽  
Vol 153 ◽  
pp. 01011
Author(s):  
Karsono Wagiyo ◽  
Tirtadanu ◽  
Umi Chodriyah
Keyword(s):  
Growth Rate ◽  
Mortality Rate ◽  
Sex Ratio ◽  
Fork Length ◽  
Fishing Gear ◽  
Growth Type ◽  
Fishing Season ◽  
Gill Net ◽  
Exploitation Rate ◽  
First Maturity

Pennahia anea in Tangerang waters have a fork length between 9.4 and 23 cm, with an average of 18.9 cm and modus 18-18.5 cm. Growth type is isometric with correlation R2 = 0.7266 and b = 3.2251. The sex ratio of female: male = 1: 0.9. Level and index maturity of gonad are highest in February and lowest in March.The length first maturity of donkey croaker at 15.8 cmFL. The length of the first capture (Lc) by danish seine net at 16,76 cmFL and by gill net at 17.60 cmFL. Asymptotic length (L∞) at 23.89 cmFL and growth rate (K) = 0.84 per year. Mortality rate; total (Z) = 4.01, natural (M) = 1.73/year and by fishing (F) = 2.28/year. Exploitation rate (E) of donkey croaker fish is 0.57. CPUE the smallest in July was 0.41 kg/trip/day, the largest was in June 9 kg/trip/day, averaging 3.3 kg/trip/day. The fishing season from July to January with its peak in November and the famine season occurs in February-June with a peak in February. The main fishing gear for catching donkey croaker fish in the Tangerang waters is the danish seine net. The highest production of donkey croaker fish in June.

scholarly journals Karakteristik Penangkapan dan Produksi Ikan di Kabupaten Barito Selatan, Kalimantan Tengah

2017 ◽  
Vol 22 (4) ◽  
pp. 215
Author(s):  
Aroef Hukmanan Rais
Keyword(s):  
Flood Plain ◽  
Rainfall Rate ◽  
Fishing Gear ◽  
Large Area ◽  
Central Kalimantan ◽  
Plain Area ◽  
Gill Net ◽  
Long Line ◽  
Fishing Gears ◽  
Lake Fish

ABSTRAK  Kabupaten Barito Selatan di Provinsi Kalimantan Tengah memiliki potensi dan produksi perikanan yang besar dari perairan umum daratan. Wilayah rawa banjiran yang luas, jumlah alat tangkap yang bervariasi dan kegiatan penangkapan yang tinggi menjadi salah satu sumber potensi dan penopang perekonomian di wilayah ini. Tulisan ini menguraikan sebaran penggunaan alat tangkap berdasarkan lokasi dan musim penangkapan dan menganalisis pengaruh curah hujan terhadap laju tangkap dan komposisi hasil tangkapan pada beberapa alat tangkap di wilayah perairan Kabupaten Barito Selatan. Pengambilan sampel dilakukan dengan menggunakan bantuan 12 orang nelayan enumerator di empat lokasi berbeda. Lokasi tersebut yaitu Danau Palui, Danau Pamait, Desa Jelapat, dan Danau Ganting. Terdapat tujuh jenis alat tangkap yaitu rawai (long line), tampirai (stage trap), lunta (cash net), banjur (stake line), rengge (gill net), lukah (pot trap) dan selambau (seine net). Data curah hujan diperoleh dari stasiun BMKG Kabupaten Barito Selatan. Data dikumpulkan selama sembilan bulan dari Februari hingga Oktober 2015. Nilai produksi dan laju tangkap dikorelasikan dengan curah hujan menggunakan uji-t, sedangkan hasil tangkapan di tabulasi sesuai jenis alat tangkap dan waktu penangkapan. Diperoleh nilai korelasi signifikan antara produksi, laju tangkap terhadap curah hujan. Sebaran alat tangkap banyak diperoleh bervariasi pada wilayah rawa banjiran yang dangkal. Sebanyak 43 spesies ikan yang tertangkap menggunakan tujuh jenis alat tangkap. Alat tangkap selambau (seine net) memiliki variasi hasil tangkapan tertinggi. The South Barito Regency has high potential and production of inland fisheries in Central Kalimantan Province. The large area of flood plain, various of fishing gears and intensive fishing. This paper describes the distribution of fishing gear utilization based on location and fishing season and, analyzes  the effect of rainfall on the fishing rate and fish composition of several kind of fishing gears in South Barito Regency waters. Samples collection were done by 12 enumerators fishermen at four different locations. The locations include Palui lake, Pamait lake, Jelapat village, and Ganting lake. Fish production was tabulated based on fishing gear and fishing periode. Rainfall rate data were obtained from BMKG (Agency for Meterology, Climatology and Geophysic) of South Barito Regency. Data were collected during nine months from February to October 2015. Production and fishing rate were significantly correlated to rainfall rate with t-test.Results show that there were about 7 fishing gears such as: rawai (long line), tampirai (stage trap), lunta (cash net), banjur (stake line), rengge (gill net), lukah (pot trap) and selambau (seine net). There is a significant corellation between production and fishing rate to the rainfall rate. The distribution of fishing gear is more varied in shallow flood plain area. About 43 species of fish were caught using 7 different fishing gears. Selambau (seine net) caught the highest variation of fish species.  

scholarly journals Increasing Abundance of Silky Sharks in the Eastern Indian Ocean: Good News or a Reason to be Cautious?

Fishes ◽  
2018 ◽  
Vol 3 (3) ◽  
pp. 29 ◽  
Author(s):  
Benaya Simeon ◽  
Efin Muttaqin ◽  
Ulfah Mardhiah ◽  
Muhammad Ichsan ◽  
Dharmadi ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Fisheries Management ◽  
Good News ◽  
Fishing Gear ◽  
Fishing Pressure ◽  
Catch Per Unit Effort ◽  
Lack Of Information ◽  
Management Area ◽  
Silky Shark ◽  
The Indian Ocean

The silky shark (Carcharhinus falciformis) is the most common shark landed in Indonesian waters, including in the Indian Ocean. However, even though they are frequently caught, there is a lack of information on the population and abundance of silky sharks in the Indian Ocean. Cilacap and Tanjung Luar are two of Indonesia’s shark fishery hotspots, both located on the edge of the Indian Ocean, which is a part of the Indonesian Fisheries Management Area (FMA) 573. The fishers from both places usually have fishing grounds in that particular fisheries management area. This research aims to update the abundance, and to investigate the factors, which influence catches of silky shark in the FMA 573 based on monthly enumeration during 2015–2016. This study found that standardized catch-per-unit-effort (CPUE) or abundance indices of silky shark in the Indonesian FMA 573 increased from 2015 to 2016. We suggested that fish immigration and decreasing fishing pressure may affect the fish abundance. Fisheries management is required to regulate the fishing pressure, such as controlling the number of boats/licenses and the number of trips or fishing gear, as well as initializing spatial and temporal fishing closure.

scholarly journals HUBUNGAN PANJANG DAN BOBOT, SEBARAN FREKUENSI PANJANG, DAN FAKTOR KONDISI TUNA MATA BESAR (Thunnus obesus) YANG TERTANGKAP DI SAMUDERA HINDIA

2017 ◽  
Vol 3 (3) ◽  
pp. 183
Author(s):  
Ria Faizah ◽  
Budi Iskandar Prisantoso
Keyword(s):  
Condition Factor ◽  
Fork Length ◽  
Length Frequency ◽  
Relationship Length ◽  
Weight Relationship ◽  
Thunnus Obesus ◽  
Long Line ◽  
The Indian Ocean ◽  
Java Sea ◽  
Relationship Of

Penelitian ini tentang hubungan panjang dan bobot, distribusi frekuensi panjang dan faktor kondisi ikan tuna mata besar (Thunnus obesus) di Samudera Hindia dilakukan pada bulan Maret sampai Oktober 2008. Hasil penelitian ini menunjukan tangkapan rawai tuna di perairan sebelah selatan Jawa Timur sampai Nusa Tenggara diperoleh ukuran tuna mata besar berkisar antara 98-153 cm (rata-rata 127,07 kg) dan bobot antara 20-73 kg (rata-rata 41,44 kg). Hubungan panjang dan bobot mengikuti persamaan W=0,023 FL2,9652 . Nilai faktor kondisi tuna mata besar berkisar antara 1,85- 2,12 dan menunjukan nilai faktor kondisi ini berfluktuasi setiap bulan. Study on length and weight relationship, length frequency distribution and condition factors of big eye tuna (Thunnus obesus) in the Indian Ocean was conducted in March to October 2008. The results showed that size of big eye tuna that caught by tuna long line from the southest of Java Sea and NusaTenggara were ranging from 98-153 cm in fork length (average of 127.07 kg); and weight range of 20- 73 kg (average of 41,44 kg). Length and weight relationship of big eye tuna can be described as W=0,023 FL2,9652. Condition factor of big eye tuna were ranging from 1.85-2.12 and that fluctuated monthly.

Age, Growth and Sex Ratio of the Azorean Rock-Pool Blenny, Parablennius Sanguinolentus Parvicornis

1995 ◽  
Vol 75 (3) ◽  
pp. 751-754 ◽  
Author(s):  
Ricardo Serrão Santos ◽  
Richard D. M. Nash ◽  
Stephen J. Hawkins
Keyword(s):  
Sex Ratio ◽  
Growth Function ◽  
Early Growth ◽  
Reproductive Season ◽  
First Year ◽  
Von Bertalanffy ◽  
Rock Pool ◽  
Total Length ◽  
Von Bertalanffy Growth Function ◽  
One Year

The age and population structure of Parablennius sanguinolentus parvicornis (Valenciennes) (Pisces: Blenniidae) from the Azores have been studied. Total length and weight relationships are given for each sex. Age study was based on otoliths readings. The von Bertalanffy growth function was applied to describe the growth in total length with age. At the end of the first year mean (±SD) total length was significantly different in males (7.1 ±1.5 cm) and females (6.1 ±1.2 cm). One-year-old males participate in reproduction as satellites, whereas females do not. The implications of this in early growth rate of the males is discussed. During the two most important months of the reproductive season (i.e. June and July), the sex ratio was significantly biased towards males, particularly in the larger size classes.

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