An analysis of production factors in carp farming in Andhra Pradesh, India.

Three major carp species, viz. catla Catla, Labeo rohita and mrigal Cirrhinus mrigala, are farmed in polyculture systems in the southern state of Andhra Pradesh, India. A survey of 189 carp farms was undertaken, and principal component analysis was used to assess the relationships between farm inputs and fish yield. Model results exhibited a strong relationship of yield with the stocking density of all three major carp species.

Resource allocation efficiency of the prawn-carp farmers of Bangladesh

This paper evaluates resource allocation efficiency of prawn-carp polyculture systems by making use of the data of 105 farmers of Bangladesh. Data Envelopment Analysis (DEA) was employed to estimate the efficiency. Mean technical efficiency (TE), allocative efficiency (AE) and cost efficiency (CE) were 85%, 58%, and 49%, respectively. Fifty percent of prawn-carp farmers displayed full TE whereas only 9%were cost efficient. Actual input application largely deviated from the technical and cost-efficient levels.

Constraints to increased yields in carp farming: implications for future genetic research

To meet the urgent need for increased carp production in developing countries of Asia, the problems that affect carp yield must be clearly identified. Planners and policy-makers need information on the relative importance of various problems so that they can design and implement strategies to solve these problems.

Genetic improvement of carp reduces poverty, hunger in Asia

Breeding programs for carp species carried out in a number of Asian countries have delivered genetically fast growing strains to farmers and producers. The economic benefits resulting from the programs are substantial. The genetic improvement of carp is one of the most profitable and sustainable ways to help poor communities in developing countries in the region.

Genetic improvement of carp species in Asia: project progress report (November 1997 to June 1998)

The Project consists of two phases, Phase I focusing on determining research priorities leading to the development of high yielding breeds and strains; documentation of carp genetic resources, documentation of carp genetic improvement and initiation of breeding programs; and Phase II concentrating on (i) continued development of improved breeds, (ii) dissemination and evaluation of improved carp species, and (iii) establishment of carp breeding programs. The Asian Development Bank (ADB) provided a Technical Assistance Grant (RETA No. 5711) for implementing Phase I.

Evaluation of the carcass and commercial characteristics of carps

The role of carcass evaluation techniques in aquaculture research programs, especially in genetics, breeding, production management, feeding and nutrition, cannot be overemphasized. Knowledge of production efficiencies and growth potentials in relation to desired carcass attributes has provided an impetus to improvements in genetic selection techniques and management of aquatic food animals. Accurate, standard and uniform methods of carcass evaluation are critically important. A standard format developed for collection of data on carps is presented in this paper.

Influence of fertilizers' types and stocking density on water quality and growth performance on Nile tilapia African catfish in polyculture system

The effects of fertilizer types and stocking density were investigated on water quality parameters that expected to affect growth performance of the polyculture of Nile tilapia <i> (Oreochromis niloticus) </i>, African catfish <i> (Claris gariepinus) </i> and sliver carp <i>(hypophthalmichthys molitrix)</i>. The purpose of this study was to determine the best type of fertilizer to use and stocking density to apply which maximizing fish yields while minimizing expenses and environmental degradation.

Genetic diversity and selective breeding of red common carps in China.

China has a very rich genetic diversity in common carp (Cyprinus carpio) and the red common carp plays an important role in Chinese aquaculture and genetic studies. Selective breeding, particularly crossbreeding has been applied successfully to red common carps in China, and the products of these efforts have been in commercial use since the 1970s. However, knowledge of the quantitative and molecular genetics of these carps is limited.

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