scholarly journals Length distribution, gonad maturity level, and catchable size of fish caught around FADs in Ternate Sea

2021 ◽  
Vol 890 (1) ◽  
pp. 012042
Author(s):  
I A Kadir ◽  
I Taeran ◽  
Z A Harahap
Keyword(s):  
Scientific Information ◽  
Length Distribution ◽  
Size Class ◽  
Maturity Level ◽  
Size Category ◽  
Gonad Maturity ◽  
Gill Nets ◽  
Study Results ◽  
Length Range ◽  
Pelagic Fishery

Abstract Pelagic fishery business in Ternate Sea are mainly based on FADs fishing operations. Increase of intensive fishing activities will also increase the pressures on local pelagic fish resources of Ternate Sea in the future. So far, there has been limited scientific information related to the fish caught by local fishers. The aim of the study was to investigate length distribution, gonad maturity level (GML), and catchable size of fishes caught around FADs. The research was conducted in August 2020 in Ternate. The research method was a survey research by collecting samples of fish caught from gill nets and hand lines for total 30 fishing trips. The study results showed that the catch consisted of mackerel scads and yellow scads. The mackerel scads caught by gill nets were between 13-26 cm in size and dominated by the 19-20 cm size class, while fishes sizes caught by hand line were between 14-27 cm which were dominated by the 18-19 cm size class. Yellow scads caught with both gill nets and handlines showed the same length range of 12-23 cm, which was dominated by the size class of 18-19 cm. Mackerel scads caught with gill nets and handlines were dominated by fish in GML II (47%) followed by GML III (32%). GML of yellow scads caught with gill nets was dominated by GML III by 75%, while for fishes caught by hand line the percentage of GML III is 68%. The mackerel scads caught with gill nets and handlines were dominated by the non-catchable size category (100% for gill nets and 98.79% for handlines). On the other hand, all yellow scads caught with both gill nets and handlines are entirely (100%) of catchable size.

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.

SELECTED MORPHOMETRIC AND BIOLOGICAL CHARACTERISTICS OF IDE LEUCISCUS IDUS (LINNAEUS, 1758) IN THE LOWER IRTYSH

2017 ◽  
pp. 46-53
Author(s):  
Elizaveta L'vovna Liberman ◽  
Andrey Aleksandrovich Chemagin
Keyword(s):  
Maximum Rate ◽  
Linear Growth ◽  
Age Groups ◽  
Annual Growth ◽  
Recreational Fishing ◽  
Opisthorchis Felineus ◽  
Gonad Maturity ◽  
Study Results ◽  
Leuciscus Idus ◽  
Old Females

Ide Leuciscus idus (Linnaeus, 1758) belongs to Cyprinidae family and is used in commercial and recreational fishing. Ide is an intermediate host of Opisthorchis felineus . In the control catches (summer 2015, the Lower Irtysh, Uvatsky, Tobolsky and Vagaysky regions of Tyumenskaya Oblast’) there were observed species with lengths 11.9-38.1 cm, with a total weight 45-1085 g. Some species aged 9 years old and even older. The maximum rate of linear growth was registered in ide species younger than 3 years old, at this age annual growth made 5 cm. The annual growth of four-year-old females made 5.4 cm, males - 2.8 cm. Females aged 3+ exceeded males in body weight and length. Species at the age 1+…2+ years old added 204.6% in their mass; at the age 2+…3+ years old - 65.3%, at 3+…4+ years old - 29.4%. Gender and gonad maturity were determined in species older than 2+, but not in all species. Among females aged 2+…4+ there were found species with I and II stage of gonad maturity. Females aged 5+ were spawned-out species having VI-II stage of gonad maturity (48%); female species aged 6+ having IV stage of gonad maturity made 33.4%. Among males in the age groups of 2+ and 3+ there were registered species with I stage (38.5 and 20%, respectively) and II stage (61.5 and 80%, respectively) of maturation only. Fatness degree of studied species ranged from 0 to 5. Species aged 2+ had I stage (24% species); in the aged groups the proportion of such species decreased (5+ years old - 7.8%; 6+ years old - 12.1%; 8+ years old - 5.9%); species aged 2-7 had II stage of fatness; proportion of older species also decreased. Species with III and IV stage of fatness were found more often (III stage was observed in 100% of the fish species at the age of 1+). Proportion of species with V stage was minor, it increased with age. According to the analysis of the study results, nutritive base in the basin is found satisfactory for ide growth and development.

scholarly journals Pedoman Tata Kelola Teknologi Informasi Menggunakan It Governance Design Frame Work (Cobit) Pada PT. X

2015 ◽  
pp. 200
Author(s):  
I Ketut Adi Purnawan
Keyword(s):  
Information Technology ◽  
High Risk ◽  
Maturity Level ◽  
Technology Governance ◽  
Information Technology Governance ◽  
Study Results ◽  
Level 3 ◽  
Frame Work ◽  
Level Of Concern ◽  
Monitoring And Measurement

 Implementation of  Information Technology (IT) in an organization require significant costs with high risk  of  failure [3]. Managing data is  a matter that must be done continuously by the organization and accompanied by monitoring and measurement of achievement that has been done as to meet the aspect of integrity, availablility. In this study using COBIT as a frame work in preparing the guidelines for information technology governance at PT.  X  on  DS11,  which  focuses  on  management of  data  about  the  level  of  concern  for management (management awareness) and  maturity level (maturity level).  The study and analysis indicates that the level of concern for management (management awareness) PT. X already on a fairly level and maturity level for the current maturity level (as is) at level 3 (defined process) and to the expected level of maturity located at level 5 (optimized). From the overall study results showed that PT. X has recognized that the data is an important organizational asset.

scholarly journals Effect of Giving Different Doses of Vitamin E in Feed to the Level of Gonad Maturity of Tilapia (Oreochromis niloticus)

2021 ◽  
Vol 5 (2) ◽  
pp. 64
Author(s):  
Gunawan Tarigan ◽  
I Wayan Arthana ◽  
Dewa Ayu Angga Pebriani
Keyword(s):  
Vitamin E ◽  
Oreochromis Niloticus ◽  
Egg Quality ◽  
Reproductive Hormones ◽  
Fish Cell ◽  
Maturity Stage ◽  
Maturity Level ◽  
Gonad Maturity ◽  
Gonad Somatic Index ◽  
Different Doses

One of the nutrients that can be given to brood feed fish to improve reproductive performance and egg quality is vitamin E. Vitamin E has a very important role in increasing fish reproduction because vitamin E functions as an antioxidant that can maintain the presence of fatty acids and prevent fat oxidation in the fish cell membrane and can accelerate the secretion of reproductive hormones. This study aims to determine the effect of vitamin E in feed at different doses on the level of gonad maturity of tilapia. The research was conducted at the Fisheries Laboratory of the Faculty of Marine and Fisheries, Udayana University from July to August 2020. The samples of fish tested were tilapia (Oreochromis niloticus) obtained from the Teratai fishing pond, Sanur Bali. Vitamin E used was Ovagrow Vit E with a vitamin E content of 50%. The CRD method (completely randomized design) was used with four treatments and three replications. The doses of vitamin E that were mixed into the feed were 0, 100, 300, and 500 mg/kg of feed. The results showed that the administration of vitamin E mixed in the feed at different doses had a significant effect on the achievement of gonad maturity level, gonad somatic index (GSI), and Fecundity (P <0.05). Provision of vitamin E at a dose of 300 mg/kg of feed was the best dose for ripening tilapia gonads. The gonad maturity level developed up to maturity stage IV, the GSI value was (3.56 ± 0.46) and the fecundity value was (1379 ± 289).

scholarly journals Participatory communication as a key strategy in the construction of citizenship

2021 ◽  
Vol 5 (S1) ◽  
pp. 890-900
Author(s):  
Felipe Anderson Rios Incio ◽  
Enaidy Reynosa Navarro ◽  
Edith Gissela Rivera Arellano ◽  
Lindon Vela Meléndez
Keyword(s):  
Web Of Science ◽  
Scientific Information ◽  
Cultural Development ◽  
Scientific Journals ◽  
Participatory Communication ◽  
Social Actors ◽  
Constant Change ◽  
Study Results ◽  
Social Empowerment ◽  
The Relationship

This research set out to analyze the importance of participatory communication as a critical strategy in the construction of citizenship through an exhaustive review of the specialized literature; whose purpose was to update the knowledge related to citizenship and its structure, participatory communication and its contribution to the construction of citizenship, as well as updated approaches to participatory communication. The scientific information supporting the study results was fundamentally extracted from scientific journals indexed in Scopus, Web of Science, Scielo, Redalyc, and Dialnet. All citations and bibliographic references were managed using Mendeley. As preliminary results, it is found that participatory communication facilitates the integration and cohesion of the communities, based on joint projects, decision-making, participation, and actions that benefit citizens. It is concluded that citizenship is in constant change depending on the citizen; also, that it is essential to recover the relationship between citizenship and participation in pursuit of socio-cultural development; likewise, that community participation must be legitimate, holistic, and inclusive; also, that the contribution of communication lies in the dynamization of social actors; finally, that participatory communication approaches make it possible to dynamize the determining social behaviors to achieve social empowerment.

scholarly journals ASPEK BIOLOGI IKAN SEBELAH (Psettodes erumei) YANG TERTANGKAP DAN DIDARATKAN DI PELABUHAN PERIKANAN PANTAI (PPP) TAWANG KABUPATEN KENDAL

2016 ◽  
Vol 5 (4) ◽  
pp. 216-223
Author(s):  
Leni Barokah ◽  
Anhar Solichin ◽  
Djoko Suprapto
Keyword(s):  
Random Sampling ◽  
Secondary Data ◽  
Simple Random Sampling ◽  
Demersal Fish ◽  
Primary Data ◽  
Maturity Level ◽  
Biological Aspect ◽  
Gonad Maturity ◽  
Egg Diameter ◽  
Descriptive Method

ABSTRAK Ikan Sebelah (Psettodes erumei) merupakan ikan demersal yang hidup di dasar perairan. Tujuan dari penelitian ini adalah untuk mengetahui aspek biologi ikan Sebelah di Perairan Kabupaten Kendal. Penelitian ini dilaksanakan pada bulan Mei-Juni 2016. Metode dalam penelitian ini adalah metode deskriptif. Pengambilan sampel menggunakan metode simple random sampling atau acak sederhana. Data primer meliputi panjang berat, tingkat kematangan gonad, dan fekunditas untuk mengetahui aspek biologi ikan Sebelah, sedangkan data sekunder meliputi data produksi ikan Sebelah selama penelitian. Hasil penelitian menunjukan ukuran panjang ikan Sebelah mempunyai kisaran 140 mm – 310 mm dan berat dengan kisaran 31 gram – 332 gram, ukuran pertama kali ikan tertangkap (L50%) adalah 228 mm. Sifat pertumbuhanya bersifat allometrik positif  dengan nilai Kn adalah 1,19. Tingkat kematangan gonad ikan Sebelah jantan didominasi oleh TKG III dan IV, sedangkan tingkat kematangan gonad ikan Sebelah betina didominasi oleh TKG IV. Nilai indeks kematangan gonad terendah pada ikan Sebelah jantan adalah 0,07% dan nilai IKG tertinggi adalah 1,03%, sedangkan nilai IKG terendah pada ikan Sebelah betina adalah 0,24% dan nilai IKG tertinggi adalah 4,41%. Fekunditasnya berkisar antara 38.832 – 64.318 butir. Diameter telur terkecil pada TKG IV dan terbesar pada TKG VI. CPUE tertinggi pada sampling minggu ke 1 yaitu sebesar 5.607 kg/kapal sedangkan CPUE terendah terjadi pada sampling minggu ke 4 yaitu sebesar 3.623 kg/kapal. Kata Kunci : Ikan Sebelah (Psettodes erumei), Perairan Kendal, Pola Pertumbuhan. ABSTRACT Flatfish (Psettodeserumei) is kind of demersal fish that lives in seabed. The aimed of this research is to find out the biological aspect of flatfish of Kendal Regency waters. The research was done in May to June of 2016. The method used in this research is descriptive method. In taking the sample, it uses simple random sampling method. The primary data include long weight, gonad maturity level and fecundity to know the biological aspect of flatfish. Secondary data include flatfish production data during research. The result shows the flatfish length is about 140 – 310 mm and its weight is about 31– 332 gram. The length of first caught flatfish (L50%) is 228 mm. Its nature of growth is allometrikpositif, and its Kn value is 1,19. The gonad maturity level of male flatfishis dominated by TKG III and IV, and the gonad maturity level of female flatfish is dominated by TKG IV. The lowest value of gonad maturity level of male flatfish is 0,07% and the highest IKG value is 1,03%, while the lowest IKG value of female flatfish is 0,24% and the highest IKG value is 4,41%. The fecundity is about 38.832 – 64.318 egg. The smallest egg diameter is in TKG IV and the biggest is in TKG VI. The highest CPUE of first week sampling is 5.607 kg/ship, while the lowest CPUE is occurred on the fourth week, i.e. 3.623 kg/ship. Keywords:Flatfish (Psettodeserumei), Kendal waters, Growth pattern.

scholarly journals Biomarkers of exposure and effect of organophosphorus compounds (literature review and results of own studies)

2019 ◽  
Vol 84 (4) ◽  
pp. 19-35 ◽  
Author(s):  
O.V. Fedchenko ◽  
P.G. Zhminko
Keyword(s):  
Functional Activity ◽  
Organophosphorus Compounds ◽  
Scientific Information ◽  
Efficient Treatment ◽  
Environmental Objects ◽  
Biomarkers Of Exposure ◽  
Study Results ◽  
Blood Neutrophils ◽  
Methods Analytical

Objective: analysis and summary of the literature data and own studies on the possibility of using biomarkers of exposure and effect of organophosphorus compounds (OPCs), determination of immunological biomarkers of the effect under exposure to OPCs that cause delayed neurotoxicity (DN). Materials and Methods. Analytical methods were used in the work: collection of scientific information on the topic, analysis of data and scientific summary of the results. Re-assessment of the effect of OPCs causing DN was performed from the perspective of determination of the most informative immunological biomarkers of the effect of known neurotoxicants. Analysis of the study results of the effect of neurotoxic OPCs, triorthocresyl phosphate (TOCP), Afos on the immune system was performed using the most sensitive model — chicken breed Leghorn in isotoxic doses (500 mg/kg and 200 mg/kg, respectively) using common immunotoxicology methods. Results and Conclusions. The article analyses and concludes current literary data on the justified use of biomarkers of exposure and effect of OPCs that are widespread in the environmental objects and are one of the reasons of acute and chronic poisoning in the population. We’ve reviewed aspects of the necessity for implementation of scientifically justified approach to the development and assessment of biomarkers and creation of the unified diagnostic complex that includes biomarkers of exposure, specific and non-specific action, with wider diagnostic abilities compared with determination of isolated parameters that is the basis for diagnostics, efficient treatment and prediction of consequences of poisoning with OPCs. Based on the results of own studies, we proposed the use of some parameters as the immunological biomarkers of the effect of OPCs with DN: the level of finely dispersed circulating immune complexes in the blood serum and the level of anti-brain antibodies, the number and functional activity of blood neutrophils; the number of T-and B-lymphocytes and their functional activity; the number of NK-cells, T-helper cells, and T-suppressors.

scholarly journals Estimating reef fish size distributions with a mini remotely operated vehicle-integrated stereo camera system

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0247985 ◽  
Author(s):  
Steven B. Garner ◽  
Aaron M. Olsen ◽  
Ryan Caillouet ◽  
Matthew D. Campbell ◽  
William F. Patterson
Keyword(s):  
A Priori ◽  
Length Distribution ◽  
Fork Length ◽  
Fish Length ◽  
Angle Of Incidence ◽  
Remotely Operated Vehicle ◽  
Camera System ◽  
Stereo Camera ◽  
Fish Model ◽  
Study Results

We tested the efficacy of a stereo camera (SC) system adapted for use with a remotely operated vehicle (ROV) to estimate fish length distributions at reef sites in the northern Gulf of Mexico. A pool experiment was conducted to test the effect of distance (1, 2, 3 or 5 m), angle of incidence (AOI; 0° to 40° at 5° increments), and SC baseline distance (BD; BD1 = 406, BD2 = 610, and BD3 = 762 mm camera separation) on the accuracy and precision of fish model length (288, 552, or 890 mm fork length) estimates compared to a red laser scaler (RLS). A field experiment was then conducted at 20 reef sites with SCs positioned at BD1 to compare fish length distribution estimates between the SC and RLS systems under in situ conditions. In the pool experiment, mean percent errors were consistently within the a priori selected threshold of ±5% at AOIs ≤10° at all distances with all four systems. However, SCs produced accurate estimates at AOIs up to 30° at all distances tested; 2–3 m was optimal. During reef site surveys, SCs collected 10.4 times as many length estimates from 4.3 times as many species compared to the RLS. Study results demonstrate that, compared to laser scalers, ROV-based SC systems can substantially increase the number of available fish length estimates by producing accurate length estimates at a wider range of target orientations while also enabling measurements from a greater portion of the cameras’ field of view.

scholarly journals Reproductive Biology of Oci Fish Selaroides leptolepis in Tomini Bay

2020 ◽  
Vol 9 (4) ◽  
pp. 407-415
Author(s):  
Nuralim Pasisingi ◽  
Putri Sapira Ibrahim ◽  
Zulkifli Arsalam Moo ◽  
Munirah Tuli
Keyword(s):  
Reproductive Biology ◽  
Sampling Method ◽  
Average Length ◽  
Time Interval ◽  
Gonad Maturity ◽  
Length Range ◽  
Management Policies ◽  
Interval Sampling ◽  
First Maturity ◽  
Fisheries Biology

Local people name Selaroides leptolepis distributed in Tomini Bay as Oci Fish. A study of the fish reproductive biology, which is one aspect of fisheries biology, is crucial to support the implementation of sustainable Oci Fish resource management policies. This study aims to determine the average length at first maturity, gonad maturity stages, and fecundity of the fish in Tomini Bay. Sampling was carried out using a stratified random sampling method from the catches of the fishermen landed in Fish Landing Base Kampung Tenda, Gorontalo City. The time interval sampling was conducted per month during April, May, and June 2020. Fish and egg samples preserved using ice cubes and a 10% formaldehyde solution correspondingly. The results of the study showed that the Oci Fish in Tomini Bay had a length range of the first maturity between 166 and 174 mm with a gonad maturity index ranging from 1.773 to 2.760%. The average fish fecundity was 16623 ± 4850 eggs.

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