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Colossal Loss of Shell and Fin-fish Larvae During Collection of Penaeus Monodon (fab.) Fry in the Rivers of Satkhira

M.S. Islam
Brackishwater Station, Bangladesh Fisheries research Institute, Khulna 9280, Bangladesh

S.U. Ahmed
Brackishwater Station, Bangladesh Fisheries research Institute, Khulna 9280, Bangladesh

M.M. Islam
Brackishwater Station, Bangladesh Fisheries research Institute, Khulna 9280, Bangladesh

Abstract/ Executive Summary:

This study was conducted in five river-estuaries of Satkhira from January to December '96. It was found that during the collection of each Peneaus monodon postlarva (PL), about 45 larvae of other shrimps, 12 individuals of fin-fishes and 530 macro-zooplankters were mercilessly destroyed. It was also recorded that about 11.6 million of P. monodon PLs were harvested annually from the study area. The study implies that colossal loss of shell and fin-fishes and other plankton resources is done by tiger shrimp fry collectors, and such massive destruction adversely affect the natural productivity and ecological balance of the coastal environment.

Keywords: Colossal loss, P. monodon fry, Finfish larvae, Shellfish larvae

Location: Satkhira

Start Date: 00-01-1996

End Date: 00-12-1996

Program Area: Animal Health and Management

Commodity: Shrimp

Objectives:

To assess the distribution of P. monodon PL and to quantify the damage done to different shrimp and fin-fish larvae and macrozooplankton during collection of P. monodon PL in the five rivers of Satkhira district.

Methodology:

Samples were collected from three selected spots of each of the five rivers of Satkhira district from January to December 1996. Fortnightly sampling was done by a fine meshed (1.0 mm) push net made of nylon with bamboo split frame (1.6m x 0.6 m) locally called "Tana jal". The net was manually operated in the shallow water against the current for about 10 minutes (for each haul). Sampling was done twice per day during low and high tides. Samples were immediately stored in a plastic pot and preserved with 5% buffered formalin solution after collection. Laboratory analysis was done within two weeks from the date of collection, penaeid shrimp larvae were identified upto species level. Macro-zooplankters including other shrimps and fin-fishes were identified as major taxonomic groups. Salinity of water was recorded with the help of a hand refractometer (model, Atago, S/Mill, 0-100%) and temperature of water was measured by an alcohol thermometer.

Source of Information: Bangladesh J. Fish. Res., 3(1): 107-112, 1999

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The present study reveal that there has been a trend of gradual reduction in the abundance of different kinds of PL of crustacean, finfish larvae and other zooplankton in neritic and inshore waters which may be due to over harvesting and indiscriminate fishing of zooplankton that hinder the usual recruitment pattern to the original mother stock, and it is a great threat to the natural biodiversity protection mechanism

Knowledge Management: Journal