Two experiments to determine the crude protein (CP) requirement of Heros severus were performed. Five isocaloric (3,200 kcal kg−1 digestible energy) diets containing five levels CP (28, 32, 36, 40, and 44%) evaluated. In first, 75 fingerlings distributed among 15 aquaria (30 L). second experiment, 100 juveniles 20 (50 A quadratic effect on weight gain, specific growth rate for length, feed inta...

Juvenile rainbow trout Oncorhynchus mykiss were subjected to one of four treatments in a two-by-two experimental design: 1) fed at density 1.8 g/m3, 2) Fasted 3) 30.1 and 4) fasted g/m3. Blood glucose hematocrit measured 4, 6, 48, 168, 336 hours after placement the two rearing densities, with relative fin lengths organosomatic indices recorded hours. Glucose levels over time not significantly d...

The length-weight relationship, condition factor, and hepatosomatic index of three the most abundant commercially valuable croaker (Sciaenidae) species in coastal waters Nigeria were examined following mass fish kills. A total 489 individuals Pseudotolithus sampled, elongatus formed bulk catch, comprising 67.55% by numbers, followed P. typus senegalensis, which represented 23.15% 22.56%, respec...

Cadmium has a high level of toxicity and can have adverse health effects on living organisms including fish. This study is conducted to identify the cadmium exposure Hepatosomatic Index (HSI) Renosomatic (RSI) Anabas testudineus. testudineus exposed four different treatment groups. The fishes were groups concentrations (0.000 mg/L, 0.005 0.010 mg/L 0.015 mg/L) for 16 weeks. results showed decre...

Juvenile rainbow trout Oncorhynchus mykiss diets containing PepSoyGen, a commercially-available fermented soybean meal product, were supplemented with methionine and other amino acids. A fish meal-based control and four experimental diets were used in a 36-day feeding trial; two diets contained 40% PepSoyGen and 10% fish meal, and two diets contained 50% PepSoyGen and no fish meal. Each of thes...

Vitamin C supplementation is important for the growth and development of bullfrog tadpoles under optimum water temperature conditions. Therefore, an experiment was carried out to evaluate effects vitamin on diet at a low temperature. A total 480 with mean weight 0.078 g were distributed in 12 aquariums each containing 40 L closed recirculation system. The experimental design entirely randomized...

865 specimens of Galeoides decadactylus were analysed for spawning, length-growth, mortality and exploitation rates in May-October 2020, to support with management information. Gonads macroscopically assessed total length-frequencies from growth models FiSAT II software. Gonadosomatic Index the stock peaked October alongside Hepatosomatic Index, attained first sexual maturity at lengths 19.8 cm...

The accumulation of cadmium, copper and zinc and the induction of metallothioneins (MT) in liver of three freshwater fish species was studied. Gudgeon (Gobio gobio), roach (Rutilus rutilus) and perch (Perca fluviatilis) were captured at 6 sampling sites along a cadmium and zinc gradient and one reference site in a tributary of the Scheldt River in Flanders (Belgium). At each site up to 10 indiv...

The relationship of gonad weight and liver weight with body weight of six fish species viz; Catla catla, Labeo rohita, Cirrhina mrigala, Hypophthlamichthys molitrix, Ctenopharyngodon idella and Cyprinus carpio under the influence of artificial feed, broiler manure, buffalo manure, N:P:K (25:25:0) and a control pond were examined after a rearing period of one year. The positive relationship betw...

The cytochrome P450c17-I (CYP17-I) is one of the enzymes critical to gonadal development and the synthesis of androgens. Two single nucleotide polymorphisms (SNPs) were detected within the coding region of the CYP17-I gene in a population of 75 male Japanese flounder (Paralichthys olivaceus). They were SNP1 (c.C445T) located in exon2 and SNP2 (c.T980C (p.Phe307Leu)) located in exon5. Four physi...