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| Registros recuperados: 19 | |
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| Oladosu, H.A.; Ayinla, O.A.; Ajiboye, M.O.; Egbomuche, G.; Onuoha, G.C.. |
| An upsurge in the prevalence of rusty-yellow discoloration of the skin of the two tilapia species, being cultured at the African Regional Aquaculture Centre (ARAC), gave a basis for an urgent clinical and epizootiological studies of the condition. The studies were therefore carried out along with the performance of some catfishes in polyculture with Oreochromis niloticus, under the integrated poultry cum fish farming system. It was observed that this condition affects the tilapia species only, and the antemortem, and postmortem examination revealed that the discolouration is restricted to the surface of the cutaneous tissue; affecting the underside of the exposed part of the scales, the fins and the skin flap covering the scale pockets, mostly in adult... |
| Tipo: Report |
Palavras-chave: Aetiology; Pathology; Aetiology; Pathology; Http://aims.fao.org/aos/agrovoc/c_15588; Http://aims.fao.org/aos/agrovoc/c_5631. |
| Ano: 1990 |
URL: http://hdl.handle.net/1834/2387 |
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| Abioye, O.M.; Adeyemo, A.A.; Ayinla, O.A.; Bekibele, D.O.. |
| Azolla pinnata as a possible replacement of the palm kernel cake in the diet of Oreochromis niloticus. Compounded diets from a control with palm kernel cake replaced at varying levels of 0, 20, 40, 60, 80, and 100% with the aquatic fern (oven dried Azolla pinnata) were fed to Oreochromis niloticus for twelve weeks to determine the acceptability and utilization of the fern in the diet, verify the nutritional influence of the fern on the performance of the fish and possible optimum palm kernel cake replacement level. The fish readily accepted the test diets. Better growth responses were recorded in the treatments containing Azolla pinnata meal. The best response was observed in the 20% replacement level, thereby suggesting an optimum replacement. However... |
| Tipo: Report |
Palavras-chave: Nutrition; Aquaculture development; Nutrition; Http://aims.fao.org/aos/agrovoc/c_49892. |
| Ano: 1993 |
URL: http://hdl.handle.net/1834/2410 |
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| Ayinla, O.A.. |
| Chemical composition of Clarias gariepinus collected from the wild was investigated. The moisture level ranged from 72.2% to 75.7% while the crude protein level was 18.9% to 19.7%.with the mean of 19.3%. The lipid content ranged from 1.04% to 1.32% (wet weight) while ash was 3.05% to 3.7%. The size of the fish did not significantly (p<0.05) affect the proximate composition. The amino acid pattern of different sizes of C. gariepins were similar with lysine level of 7.5 to 8.0g/16gN,and methionine level of 1.56 to 3.08g/16gN. PUFA of C. gariepinus ranged from 6.5to 7.8%. |
| Tipo: Report |
Palavras-chave: Aquaculture development. |
| Ano: 1993 |
URL: http://hdl.handle.net/1834/2383 |
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| Ayinla, O.A.; Nwadukwe, F.O.. |
| The effect of season on the controlled propagation of C. gariepinus was investigated. The hypophysation of C. gariepinus using the pituitary extract from the sacrificed C. gariepinus was carried out from July, 1987 to June 1988. The female broodstock weight ranged from 0.50kg while the male weight, from 0.5kg to 0.6kg. The condition factor of the female broodfish was more or less uniform (1.3 to 1.7). The results showed that there was peak production of eggs by the female during the rainy season. Eggs production for rainy season ranged from 28,000 eggs/kg body weight in June to 37,600 eggs/kg body weight in August. The percentage hatching of the fertilized eggs was also higher in the rainy season than the dry season. The highest hatching of the... |
| Tipo: Report |
Palavras-chave: Aquaculture techniques; Aquaculture development; Aquaculture techniques; Http://aims.fao.org/aos/agrovoc/c_28992. |
| Ano: 1990 |
URL: http://hdl.handle.net/1834/2436 |
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| Ayinla, O.A.; Idoniboye-Obu, T.I.E.; Omuaru, V.; Vehlow, U.. |
| The fatty acid composition of the development stages (fingerling, juvenile and adult) of some pond raised fresh water fishes (Heterobranchus bidorsalis, ‘hybrid’ of H. bidorsalis and C. gariepinus, Chrysichtys nigrodigitatus, Heterotis niloticus and Oreochromis niloticus) were determined by gas liquid chromatography (GLC). Fatty acids abundant in the stages of these fishes are palm tic acid (C16:0), Oleic acid (C18:1) and Linolenic acid (C18:3w3) . Highly unsaturated fatty acid (HUFA) such as C20:4w6, C20:2w3 and C22:4w6 acids were present in small quantity. The common features of freshwater fish is evidently displayed namely the enrichment in linolenic (18:2w6) and / or linolenic (18:3w3) fatty acids. However the presence of high proportions of... |
| Tipo: Report |
Palavras-chave: Aquaculture development. |
| Ano: 1993 |
URL: http://hdl.handle.net/1834/2216 |
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| Ayinla, O.A.; Bekibele, D.O.. |
| The fish feed and nutrition in Nigeria was reviewed. Crab meal, shrimp head meal, tadpole meal, soybean meal were used for partial or total replacement of fish meal in the diets of cultivable fish species and no satisfactory result is yet obtained for 100% of replacement of fishmeal. The cost price of species specific diets so far developed is out of tune for profitable fish farming venture. Further investigation is required to develop cost effective species specific diets. The problem in feed and nutrition was highlighted and possible solutions were proffered. |
| Tipo: Report |
Palavras-chave: Nutrition; Fish meal processing; Nutrition; Http://aims.fao.org/aos/agrovoc/c_49892. |
| Ano: 1982 |
URL: http://hdl.handle.net/1834/2435 |
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| Ayinla, O.A.; Akande, G.R.. |
| The feeding trial of C. gariepinus using three silage based diets and one fish meal based diet was carried out in concrete tanks. The four experimental diets were fed to C. gariepinus fry of relatively the same size. At the end of 8 weeks feeding trial the fish increased from their initial body weight of 0.2g, 0.4g, 0.4g and 0.4g to average final weights of 21.2g 15.4g, 12.8g and 13.8g respectively. The diet containing 41.1% resulted in the least food conversion efficiency of 1.2 over the eight weeks period. Of the experimental treatments the diets containing the highest level of fish silage (41.0%) performed better than any of the other two treatments of 19.0% and 33.5% fish silage contents. Apart from the nutritional superiority of 14% fish meal-based... |
| Tipo: Report |
Palavras-chave: Aquaculture development. |
| Ano: 1988 |
URL: http://hdl.handle.net/1834/2484 |
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| Oladosu, G.A.; Ayinla, O.A.; Onuoha, G.C.; Needom, J.G.. |
| A study of the performance of Clarias gariepinus (African Mudfish) in a polyculture with Oreochromis niloticus (Tilapia), integrated with broiler chicken production was carried at the African Regional Aquaculture Centre, Nigeria. Three experimrntal treatments were utilized. Treatment I was a polyculture of C. gariepinus and O. niloticus integrated with broiler chicken production, with application of supplemental feed to fish. Treatment II was a repeat of treatment 1, except that no supplemental feed was applied to fish, while treatment III was a polyculture of the two fish species per se with application of supplemental feed to fish. Results showed that the final individual weight, individual weight gain and recovery rate were best for C. gariepinus,... |
| Tipo: Report |
Palavras-chave: Fish culture; Polyculture; Fish culture; Http://aims.fao.org/aos/agrovoc/c_2918. |
| Ano: 1990 |
URL: http://hdl.handle.net/1834/2439 |
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| Ayinla, O.A.; Nwadukwe, F.O.. |
| The larvae of clarias gariepinus were reared in 3 plastic pools at the stocking dencity of 194.25 fry/m2 with different rates of water exchange an plankton growth for each pool. The fry(6.2mm length) in each plastic pool were fed with supplementary diet of milk powder/egg yolk suspension in the ratio of 1:1 which was replaced with fish meal paste after 8 days of rearing. After 20 days of rearing the fry in the pool with the most plankton bloom and pebles on the bottom, had the lowest motality and maximum total length of 30.4+- 7.8mm. Pleurococcus sp, Navicula sp were found to be in highest concentration in the pool where the best growth pattern was recorded |
| Tipo: Report |
Palavras-chave: Aquaculture development. |
| Ano: 1988 |
URL: http://hdl.handle.net/1834/1279 |
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| Idoniboye-Obu, T.I.E.; Ayinla, O.A.. |
| Preparative and analytical thin layer Chromatography have been used to purify and separate phospholipids from the total lipids of Callinectes latimanus (Decapoda: Portunidae) and Cardisoma armatum Decapoda: Gecarcinidae). Comparison of Rf values of standards with standard Rf values in the solvent system employed indicated the presence of phosphatidy 1 ethanolamine (PE; Rf = 0.61), phosphatidy 1 choline (PC; Rf =03.34), phophatidic acid (PA; Rf = 0.76) and phosphatidy 1 – N-methy 1 ethanolamine (PNME; Rf = 0.85). An unidentified spot with Rf = 0.93 was also detected. Gas liquid chromatography of the total lipid extract from the two Crustaceans indicated that the predominant saturated fatty acid in the two Crustaceans is palmitic acid (C16:0) with oleic... |
| Tipo: Report |
Palavras-chave: Fatty acids; Crustacean fisheries; Fatty acids; Http://aims.fao.org/aos/agrovoc/c_2818. |
| Ano: 1991 |
URL: http://hdl.handle.net/1834/2385 |
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| Nwadukwe, F.O.; Ayinla, O.A.. |
| Weekly spawn and hatching rates of Clarias gariepinus and Heterbranchus longifilis were determined in earthen ponds during the rainy and dry seasons. There was a significant increase in spawn weight from the 2nd to the 7th week after stocking C. gariepinus brood fish (p<0.05). In H. longifilis; the increase in spawn weight was significant from the 4th to the 9th weeks (P<0.05). A positive correlation was found between spawn weight and female broodfish weight from the 4th to the 9th weeks for both species. The best hatching rates were obtained during the 7th week for C. gariepinus, and in the 8th week for H. longifilis. Rainy season trials gave better results in both species than in the dry season, while only C. gariepinus produced hatchable... |
| Tipo: Report |
Palavras-chave: Fish culture; Fish culture; Http://aims.fao.org/aos/agrovoc/c_2918. |
| Ano: 1993 |
URL: http://hdl.handle.net/1834/2205 |
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| Bekibele, D.O.; Ayinla, O.A.; Saidu, A.A.. |
| A feeding trial was conducted on the replacement of fish meal (Tuna waste) with oven dried toad meal in diets for Clarias gariepinus fingerlings average weight 3.6g in concrete tanks for 56 days. Average weight gain, % weight gain, specific growth rate, apparent digestibility coefficient, protein efficiency ratio and feed conversion ratio showed no significant difference as the level of toad meal increased. The only recorded mortalities occurred in the control and treatment of (25% replacement level) at 16.67% and 8.33% respectively and may have been due to handling stress. Toadmeal compares favourably with fish meal (tuna waste) and could be conveniently used in its replacement. |
| Tipo: Report |
Palavras-chave: Aquaculture development. |
| Ano: 1995 |
URL: http://hdl.handle.net/1834/1295 |
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| Ayinla, O.A.. |
| Food and feedigng habits of Clarias gariepinus (Burchell 1822) was studied died using numerical, frequncy of occurrence and volumetric analysis. The three different stages of development of C. gariepinus collected from Olupanna Reservoir in Oyo State of Nigeria were investigated. Phytoplankton was the most important food item of C. gariepinus fingerling, juvenile and adult on the basis of numerical and frequency of occurance methods. Volumetrically insects and insect parts were the most important in the diet of fingerling while the volumes for both phytollankton and fish remains were similar. Fish and fish remains were more important in the diet of juvenile C. gariepinus than the other food items by the volumetric method. Also fish and fish. Remains... |
| Tipo: Report |
Palavras-chave: Aquaculture development. |
| Ano: 1988 |
URL: http://hdl.handle.net/1834/2215 |
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| Marioghae, I.E.; Ayinla, O.A.. |
| Macrobrachium vollenhovenii and Macrobrachion, the two largest Macrobrachium species in Nigeria waters attain maximum adult sizes of 19cm and 13.5cm respectively. Male - female ration is approximately 1.1 for both species. Male dimorphism has been observed in M. macrobrachion but not in M. vollenhovenii. Both prawns breed throughout the year (usually in the brackish waters) with peaks in the rainy season. Although berried females of M. vollenhovenii occur in landlocked water bodies, rearing the larvae has so far been successful in brackish water. Bi-weekly spawning peaks occur in M. macrobrachion but are still to be verified for M. vollenhovenii. Induced spawning has been successful carried out for M. vollenhovenii by using a combination of pituitary... |
| Tipo: Report |
Palavras-chave: Shrimp culture; Aquaculture development. |
| Ano: 1995 |
URL: http://hdl.handle.net/1834/2443 |
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| Registros recuperados: 19 | |
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