Fishponds in farming systems

This book is a collection of refereed papers on a controversial subject in agricultural development. Arguing that sustainability of fish culture in ponds needs a new paradigm - feed the pond to grow fish - two chapters focus on nutrient cycling in such systems. Another chapter makes the case for breeding Nile tilapia for resource poor farmers and presents practical options to avoid the pitfalls that arise from natural tilapia mating in low-input ponds.

Genetic diversity in wild stocks of the giant freshwater prawn (Macrobrachium rosenbergii): implications for aquaculture and conservation

The giant freshwater prawn (Macrobrachium rosenbergii) is cultured widely around the world but little is known about the levels and patterns of genetic diversity in either wild or cultured stocks. Studies have suggested that genetic diversity may be relatively low in some cultured stocks due to the history of how they were founded and subsequent exposure to repeated population bottlenecks in hatcheries. In contrast, wild stocks have an extensive distribution that extends from Southern Asia across Southeast (SE) Asia to the Pacific region.

Development of aquatic animal genetic improvement and dissemination programs : current status and action plans

WorldFish Center in collaboration with the China Academy of Fishery Sciences organized the international “Workshop on Dissemination of Improved Fish Strains: Country-Specific Action Plans” on 21-22 September (2005) in Shanghai, China, to bring together the geneticists, biodiversity and aquaculture experts from developing countries in Asia, Africa and Pacific, and representatives from advanced scientific institutions, regional and international organizations and private sector, to discuss ways to strengthen the ongoing genetic improvement and dissemination programs of member countries, and t

Breeding plan for Nile tilapia (Oreochromis niloticus) in Indonesia: individual selection.

The International Network on Genetics in Aquaculture (INGA) was established in 1993 with the objective to contribute through collaborative research, to the domestication and sustainable performance of tropical finfish species farmed in developing countries and to strengthen national capabilities for genetic enhancement through exchange of germplasm, methodologies and through training and interactive forums. To realize this objective, the network has been assisting the member countries in developing regional research programs and plans for national breeding programs.

Heritability estimates and response to selection for growth of Nile tilapia (Oreochromis niloticus) in low-input earthen ponds

This study presents results of two generations of selection (G1 and G2) for growth of Nile tilapia. The selection environment consisted of earthen ponds which were fertilized daily with 50 kg dry matter (dm)/ha chicken manure. No supplementary feeds were provided. In total, 6429 fully pedigreed experimental fish were included in the analysis. Survival till harvest was highly variable ranging from 35% to 77% and was affected by initial weight, pond, and age effects.

Mating systems and male reproductive success in Nile tilapia (Oreochromis niloticus): a microsatelite analysis

Fry production in Nile tilapia, Oreochromis niloticus is typically achieved by mass spawning of males and females stocked in large hapas suspended in ponds. In such spawning aggregations, territorial behavior and reproductive competition among males may lead to a large variance in reproductive success among individual males. We analyzed parentage and quantified male reproductive success of O. niloticus under commercial hatchery conditions in two breeding hapas each stocked with 12 males and 25 females.

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