This document is part of a series of 5 technical manuals produced by the Challenge Program Project CP34 “Improved fisheries productivity and management in tropical reservoirs”. Inland capture fisheries in India have declined in recent years, leaving thousands of fishers to sink deeper into poverty. Freshwater aquaculture in small water bodies like ponds now contributes 80% of the country's inland fish production.
It is well established that progeny of inbred matings are less fit than those of outbred matings, and that inbred individuals suffer from reduced viability and fertility. Inbreeding can be avoided by dispersal of progeny or by actively avoiding mating with kin (mate choice). We investigated the effects of sex ratio, relatedness (kinship coefficient) and level of inbreeding on the reproductive success in Nile tilapia under semi-natural mass spawning conditions in two net enclosures (hapas).
In the present study, a Border Planting (BP) pattern recommended by the Bangladesh Agricultural Research Council was tested against Regular Planting (RP) to assess the effect, if any, on gross phytoplankton photosynthesis and shading. A Wide Planting (WP) pattern was also included in the trial, as an extreme case, to assess the level of photosynthesis that might be obtained if some of the rice yield was sacrificed.
In aquaculture, traditional methods for treating infective pathogens include a limited number of government approved antibiotics and chemotherapeutics. However, this treatments may cause the accumulation of chemicals in the environment and/or fish., thus posing potential threats to consumers and the environment. The present study was conducted to determine the effects of graded levels of super biobuds (Saccharomyces cerevisiae) on the growth performance and immune responses as well as resistance of cultured Nile Tilapia to infection by Aeromonas hydrophila and Pseudomonas flourescens.
The increasing harvest of 7 edible seaweeds in Fiji and their importance to the economy of indigenous Fijians are discussed. Traditional methods in the collection, preparation and consumption of seaweeds by the Fijians are also presented.
The inland open-water fisheries of Bangladesh retained an open-access character under a traditional management method through a system of leasing out the water bodies to middlemen intermediaries. A new fisheries management policy (NMFP) is under execution attempting to replace the system of leasing out fishing rights to highest bidders (usually middlemen) for a licensing program granting fishing rights directly to genuine fishermen.
A discussion is presented on the topic of statistical data analysis in the field of ecology, emphasizing the importance of computer programmes being user friendly for the ecologist. Particular reference is given to TWINSPAN, CANOCO and PATN and the applications of these programmes to tropical fisheries and coastal zone management.
The paper describes the wide range of traditional fishing gear used by subsistence and professional fishers in the inland waters in Bangladesh as well as their impact on the fisheries and the environment. The negative impacts indicate the need for regulation of specific types of fishing gear at particular times of the year. An awareness/training program should be extended to the fishermen to create awareness of the long-term effects of their fishing practices and to impart knowledge of fishing laws.
The concepts and implementation of the Participatory Diagnosis and Adaptive Management (PDAM) framework for small-scale fishery development and management in developing countries are described.
Studies were carried out during May 1997 to January 1998 in Kishoregani district in Bangladesh to investigate the production potential of carp polyculture in combination with Amblypharyngodon mola in seasonal ponds. The preliminary results indicate that A. mola can be successfully cultured in small seasonal ponds in polyculture with carp. This practice can result in an increase in the households' consumption of small fish which have a very high content of calcium, iron and vitamin A.