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S. Chellappa N. T. Chellappa W. B. Barbosa F. A. Huntingford M. C. M. Beveridge 《Aquaculture International》1995,3(1):11-21
Experimental culture of the native Amazonian fish tambaqui, Colossoma macropomum, in fixed cages was carried out over a period of 8 months, in Lake Urubu (Rio Grande do Norte, Brazil), to assess the viability of fixed cage culture of tambaqui and to test the influence of diet on growth rates. Nine synthetic net cages (1 m3) were each stocked with 45-day-old fish (mean weight 3 g; mean total body length 51 mm) at a density of 34 fry m–3. During the first 2 months of culture, fish were fed a balanced formulated feed on an as-fed basis at the rate of 5% body weight day–1. During months 3–8 this continued for fish in treatment 1 while those in treatment 2 were fed tropical regional fruits, on a wet weight basis at the rate of 5% body wt day–1. Fish in treatment 3 were given no supplementary feed. Monthly biometric measurements were made on all fish. Fixed cage fish culture was shown to be a viable and simple technique. Survival in all treatments was 100%. With balanced supplementary feed, production was 14.4 kg m–3, compared with 4.9 kg m–3 and 2.1 kg m–3, respectively, in the treatments where fish were fed with fruits and were not given any supplementary feed. 相似文献
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S Chellappa N T Chellappa E A Silva F A Huntingford M C M Beveridge 《Aquaculture Research》1996,27(12):945-952
To assess potential competition for food with indigenous species prior to their release into reservoirs in north-eastern Brazil, the diet of hybrid red tilapia, Oreochromis niloticus O. mossambicus, maintained without supplementary feed in monocultures in freshwater ponds, was studied. The stomach contents of 160 fish (140–220 mm total length), collected monthly from February to September 1993, were analysed. Fish of all size categories were found to be phytoplanktivores. A total of 40 microalgal species were observed in the stomach contents (17 species of Chlorophyceae, 11 species of Bacillariophyceae, eight species of Cyanophyceae, three species of Chrysophyceae and one of Euglenophyceae), together with a few rotifers and some organic material. In terms of cell numbers, the overall composition of the diet was 70% Chlorophyceae, 21% Bacillariophyceae, 3% Chrysophyceae, 2% Cyanophyceae, 1% Euglenophyceae and 3% organic matter. Neither diet composition nor stomach fullness varied with fish size. However, fish had relatively fuller stomachs, with higher proportions of Chlorophyceae, Bacillariophyceae and Cyanophyceae, during the rainy season. Hybrid red tilapia appear unlikely to compete for food with a native species and so may have a role in aquaculture or for deliberate release into reservoirs in north-eastern Brazil. 相似文献
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F. A. Huntingford S. Chellappa A. C. Taylor R. H. C. Strang 《Ecology of Freshwater Fish》2001,10(2):111-117
Abstract – In a 6-month study of male sticklebacks from a single cohort of an annual population, energy reserves (carbohydrate, lipid and protein) in the carcass and gonad were found to increase from December to May. Energy reserves in the liver increased from December to March before declining between March and April, a period of marked gonadal growth in this population. Examination at the individual level of the interrelationships among the various components of the energy store (corrected for differences in body size) identified overall body condition as a major component of variation and highlighted a negative relationship between energetic investment in gonadal tissue and energy reserves in various somatic compartments. Early in the season, relative gonadal weight was largely unrelated to somatic energy reserves, but from March onwards there was a negative correlation between these two variables. These data suggest that a significant flux of glycogen and lipid from the somatic to the gonadal tissue occurs in male sticklebacks in the period just prior to the breeding season, with the extent of gonadal growth varying between individuals and occurring at the expense of overall nutritional status. Note 相似文献
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Khulape Sagar A. Maity Hemanta Kumar Pathak Dinesh Chandra Ramamurthy Narayan Ramakrishnan Saravanan Chellappa Madhan Mohan Dey Sohini 《Tropical animal health and production》2019,51(8):2529-2538
Tropical Animal Health and Production - The low potency of genetic immunization has to date impeded development of commercial vaccines against major infectious diseases. The aim of this study was... 相似文献
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Prabu Dhanasekaran Linga Vijayagopal Pananghat Ebeneezar Sanal Kalidas Chellappa Rameshkumar Palsamy Varghese Eldho Muniswaran Bose Ramar 《Fish physiology and biochemistry》2022,48(3):785-804
Fish Physiology and Biochemistry - In a feeding experiment, cottonseed meal (CSM) was used to replace fishmeal (FM) in the diet of snubnose pompano, Trachinotus blochii, supplemented with lysine... 相似文献
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Trials on induced breeding of the native Amazonian fish tambaqui, Colossoma macropomum (Cuvier), using CPE and HCG treatments, were carried out during 1992-93 at the Fish Culture Station in Natal, Brazil. Final maturation, ovulation and spermiation of tambaqui broodstock, reared in earthen ponds, were induced by injecting heteroplastic carp pituitary gland extracts (CPE) and human chorionic gonadotrophin (HCG) separately. The female spawners received double injections and the males received a single dose. Females were tranquillized using quinaldine and their genital openings were sutured before the resolving injection was administered. Latent period between the resolving injection and ovulation varied from 6 to 11 h according to the prevailing water temperature. Milt was obtained by extrusion. Stripping and dry fertilization of the eggs produced viable larvae. Relative fecundity was estimated at 140 000 eggs kg-1. Mean fertilization and hatching rates varied from 50% to 70% and from 60% to 80%, respectively. 相似文献
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