scholarly journals Reproductive biology of kawakawa, Euthynnus affinis (Cantor, 1849) in Eastern Indian Ocean

2019 ◽  
Vol 18 (3) ◽  
pp. 199
Author(s):  
Rani Ekawaty ◽  
Irwan Jatmiko
Keyword(s):  
Indian Ocean ◽  
Reproductive Biology ◽  
Fork Length ◽  
Maturity Index ◽  
Eastern Indian Ocean ◽  
Maturity Level ◽  
Gonad Maturity ◽  
Gonadal Maturity ◽  
Fish Samples ◽  
Euthynnus Affinis

Kawakawa (Euthynnus affinis) is one of the economically important fish species for fishermen in Denpasar, Bali. The objective of this study was to analyze the reproductive biology of kawakawa such as the gonadal maturity level (GML), gonad maturity index (GMI) and the length proportion of the mature gonads 50% (L50) and 95% (L95) of kawakawa in the Eastern Indian Ocean. Fish samples were collected from the fishermen catch landed at Kedonganan Fishing Port (PPI), Bali from May to September 2016. The total of fish samples collected were 168 individual. Each individual species was measured their fork length (FL), individual weight, gonad weight and determination of gonadal maturity level. The data obtained were analyzed to determine GML, GMI and proportions of gonads mature. The results showed that the fork length ranged from 26-55 cm with an average of 38 cm and dominated by a 28 cm. The maturity level of fish gonads was dominated by GML III (38%), followed by GML II (26%), GML I (22%) and GML IV (14%), respectively. The average gonad maturity index was 0.558 with a range of 0.009-5.075. The length of gonad matured in proportion 50% and 95% was 48.4 cm and 55.7 cm, respectively. It is suggested to regulating in fishing capture of kawakawa so that 50% of the fish caught have spawned.AbstrakTongkol komo (Euthynnus affinis) merupakan salah satu jenis ikan ekonomis penting bagi nelayan di Denpasar, Bali. Penelitian ini bertujuan untuk menganalisis biologi reproduksi ikan tongkol komo seperti tingkat kematangan gonad (TKG), indeks kematangan gonad (IKG) dan panjang proporsi matang gonad 50% (L50) dan 95% (L95) tongkol komo di Samudra Hindia Bagian Timur. Contoh ikan dikumpulkan dari hasil tangkapan nelayan yang didaratkan di Pangkalan Pendaratan Ikan (PPI) Kedonganan, Bali dari bulan Mei hingga September 2016. Jumlah contoh ikan yang dikumpulkan sebanyak 168 ekor, masing-masing diukur panjang cagak, bobot individu, bobot gonad dan penetapan TKG. Data yang diperoleh dianalisis untuk menentukan TKG, IKG dan proporsi matang gonad. Hasil penelitian diperoleh panjang cagak berkisar antara 26-55 cm dengan rata-rata 38 cm dan didominasi kelas panjang 28 cm. Tingkat kematangan gonad ikan didominasi oleh TKG III (38%), kemudian diikuti oleh TKG II (26%), TKG I (22%) dan TKG IV (14%). Rata-rata indeks kematangan gonad sebesar 0,558 dengan kisaran 0,009-5,075. Proporsi Panjang matang gonad 50%  dan 95% berturut-turut adalah 48,4 cm dan 55,7 cm. Perlu dilakukan pengaturan penangkapan sehingga 50% ikan yang tertangkap sudah pernah memijah.

scholarly journals Biology Reproduction Of Banggai Cardinal Fish Pterapogon kauderni Koumans, 1933 In Lembeh Strait

2020 ◽  
Vol 11 (1) ◽  
pp. 33
Author(s):  
Lolouren Mogontha ◽  
Nego E. Bataragoa ◽  
Ari B. Rondonuwu
Keyword(s):  
Sex Ratio ◽  
Total Sample ◽  
Maturity Index ◽  
Gonad Maturity ◽  
Lembeh Strait ◽  
Gonadal Maturity ◽  
Fish Samples

This research was conducted to determine the reproductive aspects of Banggai Cardinal Fish (Pterapogon kauderni) in the Lembeh Strait. Fish samples were obtained by “Small Chang Net” in the Lembeh Strait. The total sample was 150 individuals. Sex Ratio of Pterapogon kauderni in Serena Besar Island 1: 1, in LIPI 1: 1 water, and in Papusungan waters 1: 1. IKG Pterapogon kauderni  in Serena besar location in females obtained 0.26 ± 0.21 and in males 0, 26 ± 0.13. Location of Papusungan, females obtained 1.25 ± 1.00 and in males 0.37 ± 0.16. Then finally, at the LIPI location, females obtained 0.64 ± 1.12 and in males 0.50 ±,69. Gonad Maturity Levels are classified into three categories, young gonads, mature and salty gonads, with a percentage of 25% of individual young gonads, 20% of mature gonads, and 55% of saline gonads, respectively. Gonadal maturity index in each category of gonad maturity is young gonad 0.23, mature 2.16 and salin 0.27. The "Ovarian Fecundity"  is 30 ± 11 eggs, and the "Fecundity Brooding" fecundity is 48 ± 16 eggs.Keywords: Pterapogon kauderni, Sex Ratio, Gonad Maturity, FecundityABSTRAKTujuan penelitian ini untuk mengetahui aspek reproduksi ikan Capungan banggai (Pterapogon kauderni) yang ada di Selat Lembeh. Sampel ikan diperoleh dengan cara ditangkap menggunakan “Small Chang Net” Di Selat Lembeh. Total hasil tangkapan Berjumlah 150 individu. Nisbah kelamin Pterapogon kauderni di Pulau Serena Besar 1 : 1. Di perairan LIPI 1 : 1, dan di Perairan Papusungan 1 : 1. IKG Ikan Pterapogon kauderni di lokasi P. Serena Besar betina diperoleh 0,26 ± 0,21 dan pada jantan 0,26 ± 0,13. Di lokasi Papusungan, betina diperoleh 1,25 ± 1,00 dan pada jantan 0,37 ± 0,16. Kemudian terakhir di lokasi LIPI, pada betina diperoleh 0,64 ± 1,12 dan pada jantan 0,50 ± ,69. Tingkat Kematangan Gonad  dikelompookan dalam tiga kategori yakni gonad muda, matang dan salin, dengan prosentasi masing-masing 25 % idividu gonad muda, 20% gonad matang, dan 55% gonad salin. Indeks kematangan gonad pada setiap kategori kematangan gonad  adalah gonad muda 0,23, matang 2,16 dan salin 0,27.  Fekunditas “Ovarian fecundity“ adalah sebanya 30±11 butir telur, dan fekunditas “Brooding fecundity“ adalah 48±16 butir telur.Kata kunci: Pterapogon kauderni, Nisbah Kelamin, Kematangan Gonad, Fekunditas

scholarly journals Biologi reproduksi ikan layur, Trichiurus lepturus Linnaeus, 1758 di perairan pantai Kabupaten Bantul

2018 ◽  
Vol 17 (2) ◽  
pp. 227
Author(s):  
Praditha Novianingrum ◽  
Djumanto Djumanto ◽  
Murwantoko Murwantoko ◽  
Eko Setyobudi
Keyword(s):  
Sex Ratio ◽  
Length Distribution ◽  
Fish Length ◽  
Maturity Stage ◽  
Oocyte Diameter ◽  
Maturity Level ◽  
Gonad Maturity ◽  
Gonadal Maturity ◽  
Trichiurus Lepturus ◽  
Fish Samples

Largehead hairtail (Trichiurus lepturus) is one commodity fish catches with high production and value in Yogyakarta. The purpose of this research is to analyse reproductive aspects of this fish in coastal area of Bantul Regency. Yogyakar-ta. Those aspects are gonadal maturity level, fecundity, and the length at the first gonadal maturity. Fish samples are taken from the catch of fisherman using gillnet with a mesh sizes of 1.75 and 2 inches in the coastal fishing port of Depok and Samas. The fish collected from January to April 2016 with at least 30 individuals every two weeks. The samples are identified to find their sex and measured to know the length, weight, and gonadal maturity level (TKG). The data analyzed include length distribution, weight, sex ratio, gonadosmoatic index, length at the first gonadal maturity (Lm), fecundity and oocyte diameter. The result shows the fish length varies between 52.8 and 86.2 cm, and weight 115 and 567.2 g. The sex ratio between male and female was 1:0.6. Gonad maturity stage II and III are found every month observation while gonad maturity stage IV found in April. Oocyte diameter in the stage of gonadal ma-turity IV was 0.35-1.02 mm, there were two distribution modus so that the spawning expected partial spawner with fec-undity of 24.601 eggs with range was 12.873-33.534 eggs. Fecundity increased as parent’s body length with equation F= 0,434L2.60. Hairtail expected reaching the length of the first gonadal maturity in 65.55 cm, higher than the average captured, namely 63.4 cm. AbstrakIkan layur (Trichiurus lepturus) merupakan salah satu komoditas hasil tangkapan ikan di Daerah Istimewa Yogyakarta dengan jumlah produksi dan nilai yang tinggi. Penelitian ini bertujuan untuk mengkaji aspek reproduksi yang meliputi: tingkat kematangan gonad, fekunditas, dan ukuran ikan kali pertama matang gonad layur di perairan pantai Kabupaten Bantul, Daerah Istimewa Yogyakarta. Sampel ikan dikumpulkan dari hasil tangkapan nelayan yang menggunakan jaring insang dengan ukuran mata jaring 1,75 dan 2 inci di Tempat Pelelangan Ikan Depok dan Samas. Pengumpulan sampel ikan dilakukan pada bulan Januari hingga April 2016 setiap dua minggu sekali minimal 30 ekor. Sampel ikan diidentifikasi jenis kelamin, diukur panjang, bobot tubuh, bobot gonad, dan tingkat kematangan gonad (TKG). Data yang dianalisis meliputi sebaran panjang, bobot, nisbah kelamin, indeks kematangan gonad, ukuran ikan kali pertama matang gonad (Lm), fekunditas, dan diameter telur. Hasil pengamatan menunjukkan kisaran panjang ikan 52,8-86,2 cm dan bobot 115-567,2 g, nisbah betina dan jantan sebesar 1 : 0,6. TKG II dan III ditemukan pada setiap bulan pengamat-an sedangkan TKG IV banyak ditemukan pada bulan April. Diameter telur ikan TKG IV berkisar 0,35-1,02 mm, terda-pat dua modus persebaran sehingga pemijahan diduga bertahap dan fekunditas sebanyak 24.601 butir dengan kisaran 12.873-33.534 butir. Fekunditas meningkat seiring panjang tubuh induk dengan persamaan F = 0,434L2,60. Ukuran ikan layur kali pertama matang gonad diperkirakan pada panjang 65,55 cm, lebih panjang daripada ukuran rata-rata tertangkap, yaitu pada 63,4 cm.

scholarly journals Biologi reproduksi ikan layur, Trichiurus lepturus Linnaeus, 1758 di perairan pantai Kabupaten Bantul

2018 ◽  
Vol 17 (2) ◽  
pp. 227
Author(s):  
Praditha Novianingrum ◽  
Djumanto Djumanto ◽  
Murwantoko Murwantoko ◽  
Eko Setyobudi
Keyword(s):  
Sex Ratio ◽  
Length Distribution ◽  
Fish Length ◽  
Maturity Stage ◽  
Oocyte Diameter ◽  
Maturity Level ◽  
Gonad Maturity ◽  
Gonadal Maturity ◽  
Trichiurus Lepturus ◽  
Fish Samples

Largehead hairtail (Trichiurus lepturus) is one commodity fish catches with high production and value in Yogyakarta. The purpose of this research is to analyse reproductive aspects of this fish in coastal area of Bantul Regency. Yogyakar-ta. Those aspects are gonadal maturity level, fecundity, and the length at the first gonadal maturity. Fish samples are taken from the catch of fisherman using gillnet with a mesh sizes of 1.75 and 2 inches in the coastal fishing port of Depok and Samas. The fish collected from January to April 2016 with at least 30 individuals every two weeks. The samples are identified to find their sex and measured to know the length, weight, and gonadal maturity level (TKG). The data analyzed include length distribution, weight, sex ratio, gonadosmoatic index, length at the first gonadal maturity (Lm), fecundity and oocyte diameter. The result shows the fish length varies between 52.8 and 86.2 cm, and weight 115 and 567.2 g. The sex ratio between male and female was 1:0.6. Gonad maturity stage II and III are found every month observation while gonad maturity stage IV found in April. Oocyte diameter in the stage of gonadal ma-turity IV was 0.35-1.02 mm, there were two distribution modus so that the spawning expected partial spawner with fec-undity of 24.601 eggs with range was 12.873-33.534 eggs. Fecundity increased as parent’s body length with equation F= 0,434L2.60. Hairtail expected reaching the length of the first gonadal maturity in 65.55 cm, higher than the average captured, namely 63.4 cm. AbstrakIkan layur (Trichiurus lepturus) merupakan salah satu komoditas hasil tangkapan ikan di Daerah Istimewa Yogyakarta dengan jumlah produksi dan nilai yang tinggi. Penelitian ini bertujuan untuk mengkaji aspek reproduksi yang meliputi: tingkat kematangan gonad, fekunditas, dan ukuran ikan kali pertama matang gonad layur di perairan pantai Kabupaten Bantul, Daerah Istimewa Yogyakarta. Sampel ikan dikumpulkan dari hasil tangkapan nelayan yang menggunakan jaring insang dengan ukuran mata jaring 1,75 dan 2 inci di Tempat Pelelangan Ikan Depok dan Samas. Pengumpulan sampel ikan dilakukan pada bulan Januari hingga April 2016 setiap dua minggu sekali minimal 30 ekor. Sampel ikan diidentifikasi jenis kelamin, diukur panjang, bobot tubuh, bobot gonad, dan tingkat kematangan gonad (TKG). Data yang dianalisis meliputi sebaran panjang, bobot, nisbah kelamin, indeks kematangan gonad, ukuran ikan kali pertama matang gonad (Lm), fekunditas, dan diameter telur. Hasil pengamatan menunjukkan kisaran panjang ikan 52,8-86,2 cm dan bobot 115-567,2 g, nisbah betina dan jantan sebesar 1 : 0,6. TKG II dan III ditemukan pada setiap bulan pengamat-an sedangkan TKG IV banyak ditemukan pada bulan April. Diameter telur ikan TKG IV berkisar 0,35-1,02 mm, terda-pat dua modus persebaran sehingga pemijahan diduga bertahap dan fekunditas sebanyak 24.601 butir dengan kisaran 12.873-33.534 butir. Fekunditas meningkat seiring panjang tubuh induk dengan persamaan F = 0,434L2,60. Ukuran ikan layur kali pertama matang gonad diperkirakan pada panjang 65,55 cm, lebih panjang daripada ukuran rata-rata tertangkap, yaitu pada 63,4 cm.

scholarly journals Reproduction biology of Abe's flyingfish, Cheilopogon abei Parin, 1996 in Geser East Seram Strait Waters

2021 ◽  
Vol 21 (2) ◽  
pp. 167-184
Author(s):  
Friesland Tuapetel
Keyword(s):  
Fork Length ◽  
Biological Information ◽  
Female Fish ◽  
Male Fish ◽  
Gonad Maturity ◽  
Gill Net ◽  
Flying Fish ◽  
Reproduction Biology ◽  
Fish Samples ◽  
June July

Eco-biological information of Cheilopogon abei in Geser Streit is unknown. The objective of this research is to observe the sex ratio, first size maturity, gonad maturity and gonado somatic index (GSI) with fecundity of flying fish Ch abei in Geser East Seram Strait waters. Sampling was done for ten months started from February to November 2018, using gill net measuring 1.50 inch. All fish samples were measured in fork length and weighted so dissected to make observations on the level of gonad maturity and the number of eggs in female fish. A total of 682 flying fish was found during the study with a fork length range of 182.6-243.3 mm and a weight of 73.98-115.45 g. The results of the analysis showed that the proportion of the number of male fish was less than that of the female fish for almost every month of observation. The first size gonad mature of male and female is 210.5 mm and 214.1 mm FL. The gonad maturity index of male fish ranges from 0,963-7,967 and female fish ranges 1,315-8,069, the total fecundity is 2321-9438 eggs. Gonads of ripe fish in each month of observation. The spawning peak of Ch abei takes place in June-July and it is hoped that no arrests will be made in both months, to ensure the sustainability of the stock.

scholarly journals Reproductive biology of silurid catfishes Ompok miostoma (Vaillant 1902) in Mahakam River East Kalimantan

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
. Jusmaldi ◽  
Dedy Duryadi Solihin ◽  
Ridwan Affandi ◽  
MF Rahardjo ◽  
Rudhy Gustiano
Keyword(s):  
Sex Ratio ◽  
Reproductive Biology ◽  
Spawning Season ◽  
Spawning Period ◽  
Male And Female ◽  
Gonad Maturity ◽  
East Kalimantan ◽  
Fish Samples ◽  
Total Fish ◽  
Somatic Index

Reproductive biology of silurid catfish O.miostoma(Vaillant 1902)as one of endemic species in Mahakam River East Kalimantan is not yet known. This study aimed to analysisreproductive aspect related to changing seasons, including sex-ratio, spawning season, spawning location, length at first gonad maturity, gonado-somatic index, and fecundity. Total fish samples (n=1214)were collected monthly from November 2013 to October 2014 at four locations in the Mahakam River, using many fishing gears.The results of this research showthe total length of fish ranged from 132.19 to 227.30 mm and weight ranged from 20.00 to 70.40 g. The overall sex ratio of male and female was1: 1.56, while at gonad maturity stages were1:1.77. The spawning season range from November to January and peak spawning occurs in December. The highest spawning location was found at swamp flood Semayang Lake. The length at first gonad maturity of male ranged of 191.05-202.60 mm, while it was in 179.56-198.50 female. Maximum average gonado-somatic index (GSI) values obtained for male and female were 0.32 and 2.07 respectively during spawning period in November and declined to minimum in February. The total fecundity and eggs diameter rangedfrom 2648 to 12495 eggsind-1and 0.61 to 1.30 mm respectively. There was a positive correlation between fecundity andtotal length and weightof fishes.AbstrakBiologi reproduksi ikan lais O. miostoma (Vaillant 1902)sebagai salah satu spesies endemik di Sungai Mahakam Kalimantan Timur belum pernah diketahui. Tujuan penelitian ini adalah menganalisisaspek reproduksi ikan laisberkaitan dengan perubahan musimyang mencakupnisbah kelamin, musim pemijahan, lokasi pemijahan, ukuran kali pertama matang gonad, indeks kematangan gonad dan fekunditas.Total ikan contoh 1214 ekor telah dikumpulkan setiap bulan mulai dari bulan November 2013 sampai Oktober 2014di empat lokasi perairan Sungai Mahakam, menggunakan berbagai alat tangkap. Hasil penelitian menunjukkanukuran panjang total ikan berkisar dari 132,19-227,30 mm dan bobot berkisar dari  20,00-70,40 gram.Nisbah kelamin seluruh ikan jantan dan betina yang diamati 1 : 1,56, sedangkanpada tahap kematangan gonad 1:1,77. Musim pemijahan terjadi mulai dari bulan November sampai Januari dan puncak pemijahan pada bulan Desember. Lokasi pemijahan tertinggi ditemukan di rawa banjiran Danau Semayang. Ukuran ikan pertamamatang gonad pada jantan berkisar dari 191,05-202,60 mm dan betina berkisar dari 179,56-198,50 mm. Rata-rata indeks kematangan gonad (IKG)  tertinggi ditemukan pada jantan dan  betina berturut turut 0,32  dan 2,07 selama musim pemijahanpada bulan November dan menurun hingga terendah pada bulan Februari. Fekunditas total berkisar dari 2.648-12.495 butir telur per individu.Ada korelasi positif antara fekunditas dengan panjang total dan bobot ikan.

scholarly journals Potential and Management of Juvenil Payangka fish Ophieleotris aporos in lake Tondano

2017 ◽  
Vol 5 (2) ◽  
pp. 264
Author(s):  
Jan W F S Tamanampo ◽  
Nego E. Bataragoa
Keyword(s):  
Juvenile Fish ◽  
Maturity Index ◽  
Maturity Level ◽  
Gonad Maturity ◽  
Individual Number ◽  
Fishing Fleets

At this time, the nike fish in Tondano Lake has been exploited intensively in the great times.  The results show that the number of nike fishing fleets operating every  night during August 2017 fluctuated from 41 to 234 with an average of 108 fleet catchers. . Nike fish catches each month from 108 catchers are 1.2773 tonwith an individual number of 61.705.314.337,  If effectively the fisherman operate 11 month then the production of nike fish used by fisherman is 14.047 ton/year.            Fish payangka spawn throughout the year in declared with the the maturity level found gonado IV (ready to spawn phase).  The Gonad Maturity Index (GMI or IKG) shows the spawning peak in July 2017 (2.85 %  ale and Female 6.57 % and August 2017 (3.16 % male and 3.31 %).  Fecundity (number of eggs) on average each month varies based on time and location are 12.409 – 60.591 grain with an overall average of 25.613 grains.Keywords: Potential, juvenile fish, IKG, and Fecundity   AbstrakPada saat ini ikan nike  di danau Tondano telah dieksploitasi secara intensif dalam kala besar. Hasil pencatatan menunjukkan bahwa jumlah armada penangkap ikan nike yang beroperasi setiap malam sepanjang bulan Agustus 2017 berfluktuasi dari  41 sampai 234  dengan rata-rata 108 armada penangkap. Hasil tangkapan ikan nike setiap bulan dari  108  alat penangkap  adalah 1.2773 Ton, dengan jumlah individu sebanyak 61.705.314.337 . Bila secara efektif nelayan beroperasi 11 bulan maka produksi ikan nike yang dimanfaatkan nelayan sebesar 14.047 Ton / Tahun.Ikan Payangka memijah sepanjang tahun di nyatakan dengan ditemukan Tingkat Kematangan Gonad IV ( fase siap memijah). Indeks Kematangan Gonad (IKG) memperlihatkan puncak pemijahan  di  Juli 2017 (IKG Jantan 2.85 % dan betina 6.57 %) dan Agustus 2017 ( IKG Jantan 3.16 % dan betina 8.31 %).  Fekunditas (jumlah telur) rata-rata setiap bulan bervariasi berdasarakan waktu dan lokasi yakni 12.409 – 60.591 butir dengan rata-rata keseluruhan 26.613 butir.Kata kunci: Potensi, juvenile ikan, IKG,dan  Fekunditas

scholarly journals Aspek Biologi Ikan Layang (Decapterus russelli) di Perairan Latuhalat, Kecamatan Nusaniwe, Pulau Ambon

Omni-Akuatika ◽  
2016 ◽  
Vol 12 (3) ◽  
Author(s):  
Ong T.S Ongkers ◽  
Jesaja A Pattikawa ◽  
Frederick Rijoly
Keyword(s):  
Sex Ratio ◽  
Size Distribution ◽  
Growth Pattern ◽  
Sex Ratios ◽  
Purse Seine ◽  
Allometric Growth ◽  
Maturity Level ◽  
Gonad Maturity ◽  
Fish Samples ◽  
Biological Aspects

This research was carried out in the waters of Latulahalat, Ambon Island from June to August 2016. The objectives of the research were to study some biological aspects namely sex ratio, gonad maturity level, size distribution and growth pattern of scad mackerel, Decaterus russelli. Fish samples were collected every month at fish landing from purse seine fishers. Sex ratios of scad mackerel in the area were equal i.e. 1:1 with the male dominated gonad maturity levels I and IV while female dominated gonad maturity levels II, III and V.  In general, male fishes were smaller than female ones in term of length and weight. Scad mackerel in the area showed positive allometric growth except for male on August which showed isometric growth Keywords: Decaterus russelli, sex ratio, .gonad maturity level, growth pattern 

scholarly journals ANALISA ASPEK REPRODUKSI IKAN TOMAN (Channa micropeltes) DI SUNGAI BELIDA KABUPATEN MUARA ENIM

2020 ◽  
Vol 8 (1) ◽  
pp. 12-21
Author(s):  
Danang Yonarta ◽  
Yulisman Yulisman ◽  
Riswandi Riswandi
Keyword(s):  
Sex Ratio ◽  
Time Interval ◽  
Maturity Level ◽  
Female Fish ◽  
Natural Conditions ◽  
Male And Female ◽  
Gonad Maturity ◽  
Fish Resources ◽  
Gonadal Maturity ◽  
Abundant Population

Management of snakehead fish resources in swamp waters need to be done to anticipate a decline in stock in the waters. At this time the area where snakehead fish still have an abundant population is in southern sumatera, precisely in the Belida River, Muara Enim Regency. Until now there has been no information regarding the reproductive aspects of snakehead fish, their location and spawning season. The purpose of this study was to obtain information about the reproductive aspect of snakehead fish which includes sex ratio, gonad maturity level. Gonad maturity index and egg fecundity. The research was conducted in September-December 2019. The location was determined based on the natural conditions of the Belida River and human activities. Fish sampels were caught using experimental gill nets with ½ mash net size. Sampling of fish is done every 4 months with a time interval of once a month. The resuls of study in the male and female fish ratio 1,6:1. This ratio consisted of 109 fish (62,3%) and 66 female fish (37,7%). Gonadal maturity indeks  for male snakehead fish ranged from 0,21 to 0,86, while female snakehead fish ranged from 1,18 to 2,30. snakehead fish egg fecundity were 24.786 eggs with a diameter of 2,20 – 2,51

scholarly journals REPRODUCTION BIOLOGY EASTERN LITTLE TUNA Euthynnus affinis IN THE SUNDA STRAIT

2017 ◽  
Vol 8 (2) ◽  
pp. 689
Author(s):  
Vera Ardelia ◽  
Yon Vitner ◽  
Mennofatria Boer
Keyword(s):  
Reproductive Potential ◽  
Fishing Effort ◽  
Pelagic Fish ◽  
Growth Patterns ◽  
Optimum Level ◽  
Maturity Level ◽  
Gonad Maturity ◽  
Reproduction Biology ◽  
Fish Samples ◽  
First Time

<em>Eastern little tuna</em> <em>is small pelagic fish that has high economic value. Fishing effort of the eastern little tuna for the last eight years have also exceeded the optimum level. To ensure the sustainability of the pelagic fish resources, it is necessary to perform the management efforts. This study was to observe reproductive Biology of the eastern little tuna, as one of the necessary information in the management of fishery resources. Fish -samples were collected from the catch of local fishermen in April-August 2015. Based on T test (α = 0,05), the eastern little tuna</em> <em>males and females showed positive allometric growth patterns. Average size of the first time caught fish for the female (308,37 mm) and male (280,63 mm) was smaller than that observed in those first time maturity gonads (ranging  407-408 mm for female and 438-440 mm for male</em>)<em>. </em> <em>The eastern little tuna</em> <em>spawn gradually or partially (partial spawner), and</em> <em>have high reproductive potential with fecundity ranged 17.814-560.792 eggs (average fecundity: 109.807) in fish of 285-630 mm body length. The gonad maturity level of the eastern Little Tuna is dominated by Gonad maturity level I and II,(immature). The value of gonad maturity for the female level is about 0,0769-0,6879 and the male is 0,1913-0,3000.</em>

scholarly journals ASPEK BIOLOGI DAN DINAMIKA POPULASI IKAN LAYANG BIRU (Decapterus macarellus Cuvier, 1833) DI PERAIRAN LAUT SULAWESI

2019 ◽  
Vol 11 (3) ◽  
pp. 137
Author(s):  
Achmad Zamroni ◽  
Adi Kuswoyo ◽  
Umi Chodrijah
Keyword(s):  
Sex Ratio ◽  
Growth Parameters ◽  
Economic Value ◽  
Gonad Index ◽  
Fork Length ◽  
Spawning Season ◽  
Fish Length ◽  
Population Parameters ◽  
Gonad Maturity ◽  
Fish Samples

Ikan layang biru (Decapterus macarellus) merupakan salah satu jenis ikan pelagis kecil yang dominan tertangkap dan mempunyai nilai ekonomi yang tinggi, terutama untuk daerah dengan perairan yang lebih oseanik seperti di perairan Indonesia bagian timur. Tujuan penelitian ini adalah untuk mengidentifikasi parameter populasi ikan layang biru khususnya tertangkap di Laut Sulawesi. Pengambilan sampel ikan untuk diukur panjang cagak dan diamati kematangan gonad dilakukan secara acak setiap bulan. Informasi parameter populasi yang diperoleh dalam penelitian ini adalah hubungan panjang-berat, nisbah kelamin, tingkat kematangan gonad, nilai L50% dan Lm, parameter pertumbuhan serta tingkat pemanfaatan. Hasil penelitian menunjukkan bahwa sebaran ukuran panjang cagak ikan (fork length = FL) berkisar antara 10,25 - 32,25 cm, pola pertumbuhannya bersifat allometrik negatif. Nisbah kelamin ikan layang biru antara jantan : betina tidak berimbang yaitu 1 : 1,963. Ikan layang biru yang tertangkap didominasi oleh ikan dalam kondisi kematangan gonad tingkat III, artinya gonad masih dalam kondisi berkembang. Berdasarkan analisis tingkat kematangan gonad dan nilai indeks gonad dapat diketahui bahwa puncak musim pemijahan ikan terjadi pada bulan Maret. Perbandingan nilai L50% dan Lm diperoleh (L50% > Lm), artinya secara umum ikan telah mengalami matang gonad sebelum ikan tersebut ditangkap. Nilai eksplotasi lebih tinggi dari nilai eksploitasi optimal 0,5 per-tahun. Diduga puncak rekruitmen yang terjadi pada bulan Juni berasal dari musim pemijahan yang terjadi pada bulan Maret.Mackerel scad (Decapterus macarellus) is one of the dominant small pelagic fish species with high economic value, especially for areas with more oceanic waters such as eastern Indonesia. The purpose of this study was to identify the population parameters of the Mackerel scad especially those caught in the Celebes Sea. Fish samples were randomly taken to measure for length measurements and gonad maturity observation every month. Information on population parameters obtained in this study is the length-weight relationship, sex ratio, gonad maturity level, L50% and Lm values, growth parameters, and exploitation rates. The results showed that the distribution of fish length range from 10.25 - 32.25 cm of fork length, with the growth pattern was negative allometric. The sex ratio between males: females was not balanced (1: 1,963). The Mackerel scad caught was dominated by fish in the condition of level III maturity, meaning that each gonad was in a developing condition. Based on the analysis of gonad maturity and gonad index, it can be estimated that the peak of the spawning season occurs in March. A comparison of the values of L50% and Lm obtained was L50% > Lm, meaning that in general, the fish has reached gonad ripening before they were caught. The exploitation rate was higher than the optimal exploitation value of 0.5 per year. It is likely that the peak of recruitment occurred in June came from the spawning season occurred in March.

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