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Extent of Damage to Different Crustaceans and Fin Fishes in Collecting Penaeus Monodon (fabricius) Post-larvae in Satkhira Coastal Region

M.M. Islam
Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna-9280, Bangladesh

S. L. Rahman
Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna-9280, Bangladesh

G.C. Haldar
Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna-9280, Bangladesh

M. A. Mazid
Fisheries Research Institute, Mymensingh, Bangladesh

N. Mahmood
University of Chittagong, Chittagong, Bangladesh

Abstract/ Executive Summary:

The study was conducted in 1992 in the five rivers of Satkhira coastal region to assess the extent of damage caused by the collectors of Penaeus monodon post-larvae on other shrimp species. Fin fish and macrozooplankton population. It has revealed that for each P. monodon post-larva, about 38 larvae of other shrimps, 6 of fin fish and 56 macrozooplanktors were killed. The number of shrimp seed collectors has been increasing rapidly with the increase in demand of shrimp seeds. An average of 78 P. monodon post-larvae were collected per person per day during the peak period. The seed collectors caused a serious damage 10 other shrimps, fin fishes and macrozooplankton, thus adversely affecting the natural productivity and ecological balance of the estuary.

Keywords: Damage, Fin fishes, Penaeus monodon, Post larvae, Shrimp

Location: Satkhira district

Start Date: 00-01-1992

End Date: 00-12-1992

Program Area: Resource Development and Management

Commodity: Fish

Objectives:

To assess the extent of damage caused by the collectors of Penaeus monodon post-larvae on other shrimp species.

Methodology:

The study area was located in the Satkhira district south-western part of Bangladesh. Five different rivers of the region, viz., Ichamati, Coxali, Kalindi, Kholpatua and Mother were selected for sampling. In each river two stations were selected for collecting samples. Sampling stations of the five different rivers are shown in. In the Ichamati river, station I₁ was located near the bank of Debhata Thana and I₂ at a distance of 4 km upstream from station I₁. In the Coxali river, station C₁ was selected at a distance of 3 km of Kaliganj Thana sadar and C₂ at 2 km downstream from the C_I. In the Kalindi river, station K₁ was selected adjacent to the Basantapur village, 6 km away from Kaliganj Thana sadar, and station K₂ 5 km downstream from the station K_I, In the Kholpatua, station Kh_l was selected near the Nowabaki Bazaar, 10 km away from Shaymnagar Thana sadar, and station Kh₂ 4 km upstream from the station Kh₁. In the Mother, station M_I was selected adjacent to the VetkhaIi Bazaar, 9 km away from Shaymnagar Thana and station M₂ was located 3 km upstream from station M₁Shrimp seed samples were collected fortnightly from January 1992 to December 1992 using a drag net, locally known as Tana jol. The diameter of the nets' mouth was 160 cm along the long axis and 55 cm along the short axis and mesh size was 1 mm. Two samplings were made at day. time during low and high tide conditions. The net was pushed manually in the shallow areas for about 10 minutes. The samples were preserved in 5% neutralized formalin. The analyses were completed within two weeks to take advantage of the chromatophores for identification of the post-larvae upto species level. Macrozooplankton samples including shrimps and fin fishes were separated into major taxonomic groups and the 'bagda ' shrimp post-larvae were sorted out from the other post-larvae. Water quality parameters, such as, temperature, dissolved oxygen. pH and salinity were also recorded with the help of portable water test kit during the sampling period.

Source of Information: Journal of the Marine Biological Association of India, Vol-38, (1&2), 1996

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The number of fry collectors has been increasing everyday with the rise in demand for shrimp seeds. But due to continuous fishing pressure the natural stock of shrimp fry is gradually decreasing. Such indiscriminate killing of aquatic organisms might results in ecological imbalance. Cultured shrimp production depends on wild seed collection. So, to preserve the ecological balance as well as natural productivity of the estuarine environment, it is advisable that the Government takes necessary measures to educate the seed collectors through suitable extension methods, so that during P. nionodon seed collection the unwanted species arc released alive, back to the river water.

Knowledge Management: Journal