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| Registros recuperados: 25 | |
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| Aristizabal, E.O.. |
| Spontaneous spawning of red porgy was achieved in captivity by using photoperiod and temperature control systems along the year. During a four-month reproduction period females released in average about 0.2 times their own body weight in oocytes with an energy content of 5.71 J mg-1 wet weight. A total of 28.8 x 106 eggs and approximately 200 g of viable eggs (wet weight) per female kg were obtained. The eggs and larvae quality in terms of hatching and larval survival rates experienced a significant variation during the spawning season ranging between 0%-92% and 0.3%-33.2% respectively. Comments in reference to the probable causes of these variations and the need of carrying on with this line of research are presented. |
| Tipo: Journal Contribution |
Palavras-chave: Fish culture; Marine aquaculture; Spawning seasons; Fish culture; Http://aims.fao.org/aos/agrovoc/c_2918. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/1569 |
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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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| Fraga, I.; Reyes, R.; Ortega, N.; Regueira, E.; Font, R.; Bravo, A.. |
| In order to establish the management methods in snook Centropomus undecimalis (Bloch, 1792) broodstock (initial average weight 960 g), during 18 month three phases were developed. Fishes were marked, measured, weighed and distributed in 5 m3 fiber glass tanks (stock density 1.3 kg/m3). In the first phase (3 month), different feeding schedules were applied: 1. feeding in alternate days; 2. feeding every day excluding weekends; 3. feeding twice a day. Before maturation phase and during three month, enriched semi humid food was supplied. Finally, during 12 month, artificial feed was supplied. The appetite dynamics in fishes was influenced by the feeding schedule applied. When food was offered in alternate days, higher consumption was observed. Females showed... |
| Tipo: Proceedings Paper |
Palavras-chave: Fish culture; Feeding; Brood stocks; Fish culture; Feeding; Http://aims.fao.org/aos/agrovoc/c_2918; Http://aims.fao.org/aos/agrovoc/c_2838. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/2077 |
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| Anyanwu, P.E.; Awa, J.N.. |
| Polyculture trial of selected cultivable fin fishes was conducted at the Institute’s experimental fish farm Ikoyi, Lagos from April 1983 to January 1984. The species, Mugil spp; Tilapia spp; Hemichromis fasciatus and Elops lacerta gave a total annual production range of 1219 kg to 1441 kg per hectare (extrapolated). Tilapia species had the highest growth potential constituting 80% of the total harvest. Supplementary diet used was food left over (waste) from selected big hotels in Lagos. Elops lacerta (predator) recorded the highest average body weight of 415.88g while the lowest weight 62.14g, was recorded for Mugil spp. Tilapia spp and Hemichromis fasciatus had average body weights of 72.5g and 6.7 0g respectively. |
| Tipo: Report |
Palavras-chave: Fish culture; Polyculture; Fish culture; Http://aims.fao.org/aos/agrovoc/c_2918. |
| Ano: 1988 |
URL: http://hdl.handle.net/1834/2390 |
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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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| Bambill, G.A.; Oka, M.; Radonic, M.; López, A.V.; Müller, M.I.; Boccanfuso, J.; Bianca, F.. |
| The present study was conducted to determine the parameters regulating spawning performance of P. orbignyanus wild broodstock. The adaptation to captivity was successfully achieved with minimal stress levels. In three consecutive spawning seasons, the annual photothermal manipulation was not effective for the maturation and natural spawning of females although males were running. Females were HCG injected, releasing non fertilized eggs. Artificial fertilization was carried out after stripping the fish with a total production of 18,000 fertilized eggs in 2001 (egg diameter=800±10 µm), 55,300 in 2002 (egg diameter= 850±12 µm)and 1,635,000 fertilized eggs in 2003 (egg diameter 818.4 ±30.08 µm, oil drop 98.1 ±2.96 µm). For the study of the ovulationtime,... |
| Tipo: Journal Contribution |
Palavras-chave: Fish culture; Marine fish; Brood stocks; Eggs; Induced breeding; Fish culture; Eggs; Http://aims.fao.org/aos/agrovoc/c_2918; Http://aims.fao.org/aos/agrovoc/c_2502. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/1814 |
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| Aristizabal, E.O.. |
| The appearance, ossification and growth of cartilaginous structures of the mouth in early larval stages of laboratory reared red porgy Pagrus pagrus, were examined. At the time of mouth opening, red porgy larvae are equipped with the fundamental components of the oral cavity to allow the sucking motion for acquiring food. During the initial feeding stage, from day 5 after hatching (AH) to day 7 AH, the hyoid and lower branchial archs were completed, and the head length and other structural elements, like the ceratohyal-epihyal cartilage, increased rapidly. These events intensified sucking mechanisms by increasing the amount of ingested rotifers. After day 13 AH, the presence of the bony premaxilla and angular, the ossification of the Meckels cartilage and... |
| Tipo: Journal Contribution |
Palavras-chave: Marine aquaculture; Fish culture; Fish larvae; Osteology; Fish culture; Fish larvae; Http://aims.fao.org/aos/agrovoc/c_2918; Http://aims.fao.org/aos/agrovoc/c_2924. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/1560 |
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| Vega-Villasante, F.; Cortés-Lara, M.del C.; Zúñiga-Medina, L.M.; Jaime-Ceballos, B.; Galindo-López, J.; Basto-Rosales, M.E.R.; Nolasco-Soria, H.. |
| There is a global trend towards intensification of aquaculture-based systems, however a large portion of world production from aquaculture is still in small-scale "rural type" and extensive systems. The term “rural aquaculture” has been used to distinguish, from other production systems, the culture of aquatic organisms by families through extensive or semiintensive systems, for home consumption or partial marketing. Studies conducted in various regions of Mexico suggested that rural aquaculture of tilapia could be an alternative activity, able to dampen the demand and reduce pressure on natural resources. This paper analyzes the culture of tilapia considering the minimum management, with low fish density and low water exchange with the intention to... |
| Tipo: Journal Contribution |
Palavras-chave: Small scale aquaculture; Fish culture; Fish culture; Http://aims.fao.org/aos/agrovoc/c_2918. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/3520 |
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| Ezenwa, B.I.; Alegbeleye, W.O.; Anyanwu, P.E.. |
| The first phase of the project (1978 –19850 on fish seed abundance in Nigerian coastal waters was completed and published in 1985 proceedings of Fisheries Society of Nigeria (FISON). The second phase (1986 –1989) explored further, breeding grounds, nursery and schooling areas and traditional fishing gears used by local fishermen in the collection of seeds. An assessment is made of the destructive effects of industrial pollutants, oil installations, erosion, modern coastal developments, and tides in the distribution and abundance of seeds within the estuaries, creeks lagoons coastal rivers and their tributaries. Analysis of data collected showed a drastic reduction of an estimated 100 million fish seeds, Ezenwa et al (1985) to 51.7 million at the end of... |
| Tipo: Report |
Palavras-chave: Fish culture; Seed production; Fish culture; Seed production; Http://aims.fao.org/aos/agrovoc/c_2918; Http://aims.fao.org/aos/agrovoc/c_6937. |
| Ano: 1990 |
URL: http://hdl.handle.net/1834/2412 |
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| Registros recuperados: 25 | |
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