scholarly journals Stock status of Nile tilapia (Oreochromis niloticus) in Aneuk Laot Lake, Sabang District, Aceh Province, Indonesia

2021 ◽  
Vol 22 (8) ◽  
Author(s):  
Eko Prianto ◽  
Rudi Masuswo Purwoko ◽  
Kamaluddin Kasim
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Mesh Size ◽  
Fish Length ◽  
Maturity Stage ◽  
Stock Status ◽  
Gonadal Maturity ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Aceh Province ◽  
Spawning Potential Ratio

Abstract. Prianto E, Purwoko RM, Kasim K. 2021. Stock status of Nile tilapia (Oreochromis niloticus) in Aneuk Laot Lake, Sabang District, Aceh Province, Indonesia. Biodiversitas 22: 3364-3370. The Nile tilapia (Oreochromis niloticus) fishery in Aneuk Laot Lake plays a vital role in the local livelihoods. There is an indication of the massive exploitation of the species that potentially harm the stock and threaten its sustainability. This research aims to evaluate and assess the Nile Tilapia's stock status and use the results as baseline information to the management authorities. Surveys were conducted from May 2018 to April 2019 by collecting the length-weight data, sex, and gonadal maturity stage of 600 individuals. The Length-Based Spawning Potential Ratio (LB-SPR) was used to determine the Spawning Potential Ratio (SPR) and compared the results to the reference point. The results show that 50% of the females have matured at 15.1 cm, while the males at 17.8 cm. The individual fish length varies from 12.15 to 20.5 cm, whereas 50% of them were caught at size 17.8 cm (Lc50), meaning that predominantly of the fish had experienced first spawning before they were captured. The current SPR is about 5%, confirming the Nile tilapia's stock status is at an unhealthy state. Consequently, the precautionary approach, such as increasing the mesh size and limiting effort, should be considered to ensure the sustainability of the recruitment.

scholarly journals ANALISIS HUBUNGAN PANJANG BOBOT DAN PENDUGAAN PARAMETER PERTUMBUHAN IKAN NILA (Oreochromis niloticus) DI WADUK IR. H. DJUANDA

2017 ◽  
Vol 3 (2) ◽  
pp. 85
Author(s):  
Masayu Rahmia Anwar RahmiaAnwar Putri ◽  
Didik WahjuHendro Tjahjo
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Condition Factor ◽  
Growth Parameters ◽  
Parameters Estimation ◽  
Fish Length ◽  
Weight Relationship ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Weight Data

Ikan nila (Oreochromis niloticus) merupakan salah satu ikan introduksi yang mulai mendominansi hasil tangkapan ikan di Waduk Ir. H. Djuanda. Penelitian ini bertujuan untuk mengetahui hubungan panjang bobot dan menduga parameter pertumbuhan dari ikan nila di Waduk Ir. H. Djuanda. Contoh ikan didapatkan selama bulan Pebruari sampai Nopember 2008. Data panjang dan bobot ikan dianalisis hubungan panjang bobotnya dan ditentukan parameter pertumbuhannya dengan menggunakan program FISAT II. Hasil penelitian menunjukan bahwa pertumbuhan ikan nila di Waduk Ir. H. Djuanda bersifat allometrik negatif dengan persamaan W=0,129L2,4608,yang menandakan pertambahan bobotnya tidak secepat pertambahan panjangnya (b<3) dengan faktor kondisi 1,15.Ukuran panjang ikan yang tertangkap berkisar antara 11-41 cm. Hasil pendugaan parameter pertumbuhan diperoleh L=44,10 cm, K=0,72 (per tahun), dengan Z=2,4, M=1,34, F=1,06, dan E=0,44. Nile tilapia (Oreochromis niloticus) is one of introduction fishes that begin to dominate yield of fish capture at Ir. H. Djuanda Reservoir. The aim of this research was to know the length weight relationship and growth parameters estimation of nile tilapia at Ir. H. Djuanda Reservoir. The samples were collected during February until November 2008. The length and weight data of nile tilapia were analyzed its length weight relationship and the growth parameters were evaluated by FISAT II. The research shows that the characteristic of nile tilapia growth’s at Ir. H. Djuanda Reservoir was allometric negative with similarity W=0.129L2.4608, that indicated the increasing of weight from this fish not fast as its length (b<3) with the condition factor of it was 1.15. The range measure of fish length that captured was 11-41 cm. The results from growth parameters estimation were L=44.10 cm, K=0.72 (per year), with Z=2.4, M=1.34, F=1.06, and E=0,44.

scholarly journals UKURAN PERTAMA KALI MATANG GONAD DAN SELEKTIVITAS JARING INSANG IKAN NILA (Oreochromis niloticus) DI WADUK JATILUHUR, JAWA BARAT

2019 ◽  
Vol 18 (3) ◽  
Author(s):  
Andri Warsa ◽  
Lismining Pujiyani Astuti
Keyword(s):  
Fisheries Management ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Mesh Size ◽  
Fishing Gear ◽  
Fish Size ◽  
Total Length ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Size Interval

A gillnet is a common fishing gear for exploitation and fish capture at Jatiluhur Reservoir. The fish size captured by the gillnet depends on the mesh size for its selective fishing gear. Determination of gillnet mesh size is one of effort for fisheries management.  The management of nile tilapia (Oreochromis niloticus) is based on gillnet selectivity and reproductive biology of nile tilapia. The aim of the research was to estimate length at the first mature (Lm) and gillnet selectivity for nile tilapia. The research was conducted at February-September 2017 through experimental fishing using gillnet with 1.0–4.0 mesh size (interval 0.5 inch). The gillnet installation was performed at six stations, namely Cihuni-Cibadak, Sungai Cikanyayan, Sungai Ciririp, Sungai Cihonje, Pasir Kole and Cilalawi. The Lm of nile tilapia was 18.3 and 23.3 cm for female and male, respectively. The total length retained in the gillnet with the highest probability for mesh size 1.0; 1.5; 2.0; 2.5; 3.0; 3.5 and 4.0 inches were 9.5; 12.5; 14.5; 18.5; 20.5; 26.5 and 30.5 cm, respectively. The minimum mesh size used for nile tilapia exploitation was ≥3 inches because it was able to catch nile tilapia with the total length larger than Lm (Lc>Lm) and with an SPR value of > 40% so that the tilapia resource in the Jatiluhur Reservoir remains sustainable.  

The effect of vaccination in controling bacterial disease caused by Aeromonas hydrophila in nile tilapia (Oreochromis niloticus)

2014 ◽  
pp. 27
Author(s):  
Arne A Ratulangi ◽  
Reiny Tumbol ◽  
Hengky Manoppo ◽  
Henneke Pangkey
Keyword(s):  
Survival Rate ◽  
Aeromonas Hydrophila ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Bacterial Disease ◽  
Immersion Method ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Different Ages ◽  
Motile Aeromonas Septicaemia

This study aims to apply vaccination against bacterial disease. The purpose of vaccination is to trigger the immune respone both non-specific and specific of fish against bacteria Motile Aeromonas Septicaemia (MAS) caused by Aeromonas hydrophila. The vaccination for fish with different ages: 2-3 weeks and 5 weeks were done using immersion method. The fish were re-vaccinated (booster) after two weeks of the first vaccination. The survival rate was < 50 % for juveniles 2-3 weeks and > 50% for juveniles 5 weeks. Survival rate for juveniles 5 weeks was higher than juveniles of 2-3 weeks. This shows that organs of juveniles of 5 weeks were more complete than the 2-3 weeks juveniles. The age of fish is one of the important factors for successfully vaccination. Penelitian ini bertujuan untuk melakukan penerapan vaksinasi terhadap penyakit bakterial. Vaksinasi ditujukan untuk merangsang respon kekebalan non- spesifik dan spesifik pada tubuh ikan terhadap penyakit Motile Aeromonas Septicaemia (MAS) yang disebabkan oleh bakteri Aeromonas hydrophila. Vaksin diberikan pada benih ikan nila yang berbeda umur yaitu 2-3 minggu dan 5 minggu dengan menggunakan metode perendaman. Ikan divaksinasi ulang (booster) setelah 2 (dua) minggu dari vaksinasi yang pertama. Prosentase kelangsungan hidup < 50 % untuk benih umur 2-3 minggu dan > 50% untuk benih umur 5 minggu. Jumlah kematian benih umur 2-3 minggu lebih tinggi dari 5 minggu. Hal ini menunjukkan bahwa fungsi organ benih umur 5 minggu telah lebih lengkap dari pada benih umur 2-3 minggu. Umur ikan merupakan salah satu faktor penting penentu keberhasilan suatu kegiatan vaksinasi.

Effect of low temperature on genomic DNA methylation in Nile tilapia (Oreochromis niloticus)

2013 ◽  
Vol 37 (10) ◽  
pp. 1460 ◽  
Author(s):  
Huaping ZHU ◽  
Maixin LU ◽  
Zhanghan HUANG ◽  
Fengying GAO ◽  
Xiaoli KE ◽  
...  
Keyword(s):  
Dna Methylation ◽  
Low Temperature ◽  
Oreochromis Niloticus ◽  
Genomic Dna ◽  
Nile Tilapia ◽  
Nile Tilapia Oreochromis Niloticus
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