scholarly journals Breeding season, fecundity, length-weight relationship and condition factor of Oreochromis niloticus L. (Pisces: Cichlidae) in Lake Tana, Ethiopia

1997 ◽  
Vol 20 (1) ◽  
Author(s):  
Zenebe Tadesse
Keyword(s):  
Breeding Season ◽  
Oreochromis Niloticus ◽  
Condition Factor ◽  
Lake Tana ◽  
Weight Relationship

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 Length-weight Relationship and Condition Factor of Cichlids in Eniong and Lower Cross Rivers, Niger Delta, Nigeria

2021 ◽  
pp. 29-37
Author(s):  
P. Ugbomeh, Adaobi ◽  
J. Etuk, Victor ◽  
I. Ugbomeh, Leonard ◽  
C. Akani, Godfrey
Keyword(s):  
Oreochromis Niloticus ◽  
Niger Delta ◽  
Condition Factor ◽  
Good Condition ◽  
Well Being ◽  
Positive Allometry ◽  
Cross River ◽  
Weight Relationship ◽  
Sarotherodon Melanotheron

Length-weight relationship and condition factor are essential parameters used in determination of growth and well-being of fish. The length-weight relationship and condition factor of eight species of cichlids were examined from a total of 358 cichlids belonging to fourteen species and seven genera. Sampling was between January and June, 2020 in Eniong River and lower Cross River in the Niger Delta from three stations: station one in Eniong river, station two at the confluence of Eniong and lower Cross River, and station three at the lower Cross River. The length and weight of each fish was measured to the nearest millimeter and gram, respectively. The length-weight relationship (LWR) and condition factor (K) of the species Coptodon dageti, Coptodon guineensis, Coptodon zilli, Chromidotilapia guntheri, Hemichromis elongatus, Oreochromis niloticus, Pelmatolapia mariae and Sarotherodon melanotheron were determined using standard methods. Total length of fish ranged from 12.9 ± 5.01 in H. elongatus to 20.7 ± 3.37cm in C. zilli. Total weight ranged from 24.8 ± 13.80 in H. elongatus to 146.4 ± 68.0 g in C. zilli. The exponent b ranged from 1.54 for H. elongatus to 3.34 in Pelmatolapia mariae. The coefficients of determination (r2) varied between H. elongatus (0.74) and O. niloticus (0.96). Fulton’s condition factor (K) ranged from 1.2 6 ± 0.50 (H. elongatus) to 1.89 ± 0.43 (O. niloticus). Length-weight relationship revealed negative allometry for six species and positive allometry for two species (O. niloticus and P. mariae). Cichlids in this study were observed to be in good condition, as the K values were greater than one.

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