To target development efforts, the technological options for investments in Clarias gariepinus hatchery systems were compared for cost, average weight, number of fingerlings harvested, survival and profitability in periurban Yaoundé, Cameroon. Costs were proportional to the level of intensity of production, with labour accounting for about 70% of the total. Profitability was similar among systems, with highly variable survival being a key constraint.
Silver barb (Puntius gonionotus Bleeker 1850) is an Asian carp that is popular as a food fish. It is distributed throughout Thailand in rivers, canals, reservoirs and swamps. It is also cultured in ponds and paddy fields. Its production from aquaculture in 2003 was estimated at 49,066 f metric tons (14 per cent of the total fish production), and valued at 34.6 millions US dollars, ranking third among freshwater fishes cultured in Thailand. However, the performance of many hatchery populations of silver barb is low, mainly due to a lack of improved stocks.
An account is given of research activities conducted in Malaysia regarding carpet shell clam seed production by artificial means. Serotonin injection resulted in egg and sperm release within 1/2-2 hours of receiving the injections. Details are provided of rearing procedures and diets.
Following a brief description of lake-based hatcheries and nurseries for tilapias, the advantages as compared to land-based systems are discussed, indicating also some of the disadvantages.
This study was carried out in order to understand the technical and economic characteristics of different Egyptian Nile tilapia (Oreochromis niloticus) hatchery systems. Hatchery operators at fifty tilapia hatcheries in four governorates were interviewed and four focus group discussions were held with 61 participants in March 2012.
The Aquaculture for Income and Nutrition (AIN) project implemented by World Fish and funded by USAID, aims at increasing aquaculture production in 20 districts of Southern Bangladesh (Greater Khulna, Greater Barisal, Greater Jessore and Greater Faridpur) to reduce poverty and enhance nutritional status. As part of its initial scoping activities World Fish commissioned this value chain assessment on the market chains of carp fish seed (spawn, fry and fingerlings) in the southern region of Bangladesh.
Details are given of trials conducted in Thailand using the "hapa" system for nursing fish fry to fingerlings of the desired size for use in small scale aquaculture operations.
The hatchery technologies for Nile tilapia and African catfish training is a 5-day course designed for aquaculture hatchery and farm operators and managers, researchers, technicians, and extension workers. It provides hands-on training in modern aquaculture research and management techniques, especially in relation to tilapia and African catfish. The course includes the latest information on production methods shown to be reliable in the field, demonstrates updated technology for mass production of fish seed, and covers farming practices for different farming conditions.
Local production of mixed sex Nile tilapia in irrigated rice fields has been introduced, established and then spread through farmer-to farmer contact in Northwest Bangladesh benefiting poor households in a number of ways. Food fish farmers have improved access to high quality seed at the time of peak demand early in the monsoon season. The seed producers benefit through small but strategic cash flows but also improved production of their fish for their own consumption, both as large fingerlings and fish after further grow on.
The main objectives of this project are to provide guidelines for the effective management and development of natural cockle seed resources and their future conservation to supply an expanding cockle industry. To assess the potential for etpansion of the cockle culture industry by improving production from existing culture beds and by establishing culture beds in new areas.