scholarly journals Overview of Length-Weight Relationship, Condition Factor and Size at First Maturity of Nile tilapia Oreochromis niloticus (L.) in Different Water Bodies of Ethiopia: A Review

2018 ◽  
Vol 8 (3) ◽  
pp. 021-028
Author(s):  
Agumassie Tesfahun ◽  
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Condition Factor ◽  
Water Bodies ◽  
Weight Relationship ◽  
Nile Tilapia Oreochromis Niloticus ◽  
First Maturity ◽  
Size At First Maturity

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 Tade gray mullet, Chelon planiceps (Valenciennes, 1836) from Hooghly-Matlah Estuary, West Bengal, India

2017 ◽  
Vol 5 (1) ◽  
Author(s):  
Soumendra Pramanick ◽  
Sudhir Kumar Das ◽  
Dibakar Bhakta ◽  
Canciyal Johnson
Keyword(s):  
West Bengal ◽  
Condition Factor ◽  
B Value ◽  
Size Group ◽  
Estuarine System ◽  
Weight Relationship ◽  
Relative Condition Factor ◽  
Biological Management ◽  
First Maturity ◽  
Size At First Maturity

Tade gray mullet (Chelon planiceps) forms a lucrative fishery in the Hooghly-Matlah estuarine system. During eight months of investigation 232 specimens were examined to study length-weight relationship and relative condition factor (Kn). The length and weight of fish was varied from 41 to 283 mm and 0.81 to 208 g respectively. Two length-weight relationship equations were obtained from the analysis, W=0.0000397L2.952 for <187 mm size group and W=0.0000406L2.834 for >187 mm size group. The size at first maturity was recorded as 187 mm. The b value was not significantly different from 3 indicating isometric growth. The monthly mean Kn for the male and female were 1.041–1.125 and 1.009–1.236 respectively. The highest Kn value was recorded in July for both the sexes, which may be due to advance maturity stages. The present study will be useful in the context of biological management of mullet fishery as well as to find out aqua-farming potential of Tade gray mullet.

Effect of ambient oxygen on growth and reproduction in Nile tilapia (Oreochromis niloticus)

2008 ◽  
Vol 65 (7) ◽  
pp. 1413-1424 ◽  
Author(s):  
Jeppe Kolding ◽  
Lise Haug ◽  
Sigurd Stefansson
Keyword(s):  
Oxygen Concentration ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Gonadosomatic Index ◽  
Size At Maturity ◽  
Low Oxygen ◽  
Asymptotic Size ◽  
Ambient Oxygen ◽  
Nile Tilapia Oreochromis Niloticus ◽  
First Maturity

Growth, size at maturity, gonadosomatic index (GSI), egg size, and absolute fecundity of Nile tilapia ( Oreochromis niloticus ) were significantly affected by oxygen levels (1.5 ± 1.0, 2.8 ± 1.4, and 6.0 ± 1.8 mg·L–1) in a controlled experiment designed to test the hypothesis (D. Pauly. 1984. J. Cons. Int. Explor. Mer, 41: 280–284) that O2 is the controlling factor for the transition from juvenile to adult in fish, in general, in the context of phenotypic life history plasticity and “stunting” in tilapias. Size at maturity and the estimated asymptotic size decreased with decreasing O2 concentration, as predicted by Pauly’s hypothesis. All fish matured at the same age (18 weeks old), which is in contrast to conventional definitions of stunting. This finding challenges the suggested plasticity in age at first maturity for tilapia. The results also challenge the hypothesis that stunting is a unique recruitment mechanism, as the smaller fish in the group with low oxygen concentration produced smaller and fewer eggs than the larger fish in the group with high oxygen concentration.

Incorporation of dietary palm date pits in all-male Nile tilapia (Oreochromis niloticus) diets

2018 ◽  
Vol 10 (3) ◽  
pp. 193-202
Author(s):  
NEDAL MOHAMMED SIDDIG SWAR ◽  
ASAAD HASSAN WIDAA MOHAMED
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Fish Meal ◽  
Condition Factor ◽  
Control Diet ◽  
Animal Protein ◽  
Partial Substitution ◽  
Date Seed ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Bakery Yeast

Swar NMS, Mohamed AHW. 2018. Incorporation of dietary palm date seeds in all-male Nile tilapia (Oreochromis niloticus) diets. Nusantara Bioscience 10: 193-202. The study utilizes a 45-days randomized factorial design 3×2, three levels (25, 50 and 75%) of palm date seeds, three levels (non, with and without) of 3% bakery yeast (Saccharomyces cerevisiae) and three replicates. The observation was carried out in twenty-one plastic aquaria. All-male Nile tilapia (Oreochromis niloticus) fingerlings were put in each aquarium. Each aquarium was provided with well-aerated and triggered dechlorinated tap water with an average weight of 1.9±1.11 g/fish (10 fish/aquaria) and a total length of 5.18±0.69 cm/fish. Fish were given food three times/day (10 days, at 8.30,11.30, 3.30 A.M) at a rate of 12, 8 and 4% of body weight, to examine the impact of partial substitution of animal protein (fish meal) in the diet on growth achievement, carcass contexture, feed utilization, condition factor (k) and feed expense. Seven experimental diets were prepared; control diet (T0, CP 36.84) concluding 45% (fish meal) as animal protein and 0% (palm date seed meal) plant protein. Tested diets (T1, T2 and T3) concluding 25, 50, 75% with 3% bakery yeast (CP 35.71, 35.53, 34.74) and 25, 50, 75% without yeast (CP36.01, 36.27 and 35.57) respectively ; so, they substitute about 75, 50, and 25 of fish meal diet respectively. The outcomes showed that, tilapia were given food on T1, T2 and T4 diets (25, 50, and 25%) substitution with and without yeast respectively registered the greater growth achievement, feed and protein utilization than other experimental diets such as control diet, also they indicate the highest condition factor (K) grades which state that the fish are in decent health. Tilapia were given food by diet T3 (25% fish meal) T5, T6 (50 and 25% fish meal) with and without yeast respectively possessed deficient growth and diverged remarkably (p>0.05) from the other diets. Diet contexture remarkably had an impact on carcass contexture. These data prompted that Palm date seed with and without yeast S. cerevisiae can, to a certain extent, substitute fish meal (animal protein) in a diet for all-male Nile tilapia fingerlings at level-up to 50 and 25% with and without yeast respectively, without any unfavorable result on accretion achievement. Furthermore, fish diet, partially substituted with 3% yeast, resulted from superior accretion achievement than other diets within the present experimental circumstance. This study showed that there is an economic efficiency of confounding palm date seed (plant protein) as partial substitution of fish meal (animal protein) with and without yeast in all-male Nile tilapia, that it could decrease the expense of feeds.

scholarly journals Comparative Growth Performance of Genetically Male, SexReversed, and Mixed-Sex Nile Tilapia (Oreochromis niloticus) Reared in Earthen Ponds in Sagana, Kenya

2020 ◽  
Vol 21 (1) ◽  
pp. 23-30
Author(s):  
Mary A. Opiyo ◽  
Kevin O. Obiero ◽  
Jacob Abwao ◽  
Fonda Jane Awuor ◽  
Domitila Kyule ◽  
...  
Keyword(s):  
Growth Performance ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Crude Protein ◽  
Condition Factor ◽  
Sex Reversal ◽  
Early Maturity ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Body Weights ◽  
Earthen Ponds

Nile tilapia (Oreochromis niloticus) culture has been faced by challenges of prolific breeding and early maturity of mixed-sex tilapia that can be solved by the culture of all-male tilapia. A study was conducted to compare the growth performance, survival and condition factor of genetically male tilapia (GMT), sex-reversed tilapia (SRT) and mixed-sex tilapia (MST) cultured in earthen ponds. Fingerlings of initial weights ranging from 0.41 to 0.91 g for GMT, SRT and MST were stocked in 150 m2 earthen ponds in triplicates at 3 fish m-2 and fed on a 35% crude protein diet. After 180 days culture period, the final body weights of SRT (202.82±7.30 g) was significantly higher than GMT (174.34±3.71 g) and MST (148.06±4.60 g) (P<0.05). The survival of MST (74.11±4.73%) was higher than GMT (67.22±9.72%) and SRT (65.22±2.94%) but no significant differences were observed (P>0.05). The condition factor of all the fish was above 1 and was significantly different between the groups (P<0.05). This study demonstrates that SRT has superior growth performance than GMT and MST hence sex reversal should be used for improved Nile tilapia production.

scholarly journals Protozoan and metazoan parasites of Nile tilapia Oreochromis niloticus cultured in Brazil

2012 ◽  
pp. 2812-2819 ◽  
Author(s):  
Wanderson Pantoja MF ◽  
Ligia Neves R ◽  
Márcia Dias RD ◽  
Renata Marinho GB ◽  
Daniel Montagner ◽  
...  
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Condition Factor ◽  
First Record ◽  
The State ◽  
Parasitic Infections ◽  
Fish Farms ◽  
Metazoan Parasites ◽  
Relative Condition Factor ◽  
Nile Tilapia Oreochromis Niloticus

ABSTRACTObjective. This study describes the parasitic fauna and relative condition factor (Kn) in Nile tilapia Oreochromis niloticus L. (Cichlidae) from fish farms in the State of Amapá. Material and methods. 123 fish from four fish farms in the state of Amapá, Brazil were necropsied for parasitological and Kn analysis. Results. 64.2% of the examined fish, had the gills infected with Cichlidogyrus tilapiae Paperna, 1960 (Monogenoidea: Dactylogyridae); Ichthyophthirius multifiliis Fouquet, 1876 (Protozoa: Ciliophora), Trichodina Ehrenberg, 1830 and Paratrichodina africana Kazubski & El-Tantawy, 1986 (Protozoa: Trichodinidae). The highest prevalence found corresponded to Monogenoidea C. tilapiae while the lowest corresponded to Trichodinidae. However, I. multifiliis was the parasite that presented the greatest intensity and abundance. The differences found in the infection rates of the different fish farms due to causes further discussed. The parasitism did not influence the relative condition factor (Kn) of fish. This was the first record of P. africana in Brazil and occurred in the Eastern Amazon. Conclusions. In Brazil, Lamproglena sp. is an emerging parasite in the Southern and Southeastern regions, but this crustacean was not found in the Nile tilapia in the State of Amapá. The parasitic infections in Nile tilapia farmed in Brazil are caused by protozoan, monogenoidea, crustacea and digenea species, and the regional differences on their prevalence and intensity rates are discussed in this study.

scholarly journals Effects of fixation and freezing on some morphometric characteristics of Nile tilapia

2020 ◽  
Vol 7 (1) ◽  
pp. 90-97
Author(s):  
Emmanuel O. KOMBAT ◽  
Elliot H. ALHASSAN ◽  
Daniel N. AKONGYUURE
Keyword(s):  
Body Weight ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Condition Factor ◽  
Storage Period ◽  
Formaldehyde Solution ◽  
Morphometric Characteristics ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Significant Difference ◽  
Single Cohort

Fish preservation methods including use of formalin and freezing are widely used to preserve fish specimen in the laboratory to maintain their freshness for future laboratory analysis. This present study aimed to investigate the effects of fixation and freezing on the morphometric characteristics of Nile tilapia, Oreochromis niloticus. Forty (40) samples of a single cohort of O. niloticus were obtained from the Tono reservoir in Navrongo, Ghana. Total length (TL) and body weight (W) of each fish were measured. Twenty (20) samples of O. niloticus were subjected to freezing at -4ºC whilst the remaining twenty (20) were fixed in 4% formaldehyde solution. The study lasted for thirteen (13) days during which the length and weight were determined repeatedly in a sequence during the storage period. Although there was no significant difference (p > 0.05) in the change of length and weight measured during the study, all samples showed some degree of shrinkage within the storage period. For samples preserved by freezing, there was a 5.62 % and 19.61 % reduction in length and weight respectively, while those preserved in formalin reduced by 5.24% and 10.72% in length and weight respectively. For condition factor (k), there was no change at the end of the experiment for samples preserved by freezing but a marginal increase of 0.08% was realized for those preserved in formalin. Though shrinkage occurred in both samples preserved in formalin and freezing, the greatest shrinkage was recorded by those preserved by freezing.

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