Gillnet selectivity of small cyprinids in three Sri Lankan reservoirs

Winkler G., . and Amarasinghe U. S., . and Schabuss M., . and Ajith Kumara P. A. D., . and Schiemer F., . Gillnet selectivity of small cyprinids in three Sri Lankan reservoirs. pp. 885-900. ISSN 0116-6514

As it has been reported that there is a harvestable potential of presently unexploited small cyprinid species in Sri Lankan reservoirs attempts were made to investigate the gillnet selectivity for small cyprinids in three reservoirs with a view to defining regulatory measures for the subsidiary gillnet fishery. As exotic cichlids support profitable fisheries in reservoirs of Sri Lanka any strategy to exploit small cyprinids should not adversely affect the cichlid stocks. Possibly due to the depth preference exotic cichlids are not caught in small mesh (12.5 to 37 mm) gillnets which are set in the areas with water depths of over 2 m. The effective mesh sizes (stretched) of gillnet which were set in these areas were 16 and 20 mm for Amblypharyngodon melettinus and 33 and 37 mm for Puntius chola and P. filamentosus. Although P. dorsalis is caught in significant numbers in 50 and 60 mm mesh gillnets this species is unlikely to be exploited without harming exotic cichlids because sub-adults of exotic cichlids are also caught in these mesh sizes. The importance of gillnet selectivity studies of small indigenous cyprinids in Sri Lankan reservoirs is discussed.

Full text available from: Official URL: http://www.asianfisheriessociety.org/publication/d...

Abstract

As it has been reported that there is a harvestable potential of presently unexploited small cyprinid species in Sri Lankan reservoirs attempts were made to investigate the gillnet selectivity for small cyprinids in three reservoirs with a view to defining regulatory measures for the subsidiary gillnet fishery. As exotic cichlids support profitable fisheries in reservoirs of Sri Lanka any strategy to exploit small cyprinids should not adversely affect the cichlid stocks. Possibly due to the depth preference exotic cichlids are not caught in small mesh (12.5 to 37 mm) gillnets which are set in the areas with water depths of over 2 m. The effective mesh sizes (stretched) of gillnet which were set in these areas were 16 and 20 mm for Amblypharyngodon melettinus and 33 and 37 mm for Puntius chola and P. filamentosus. Although P. dorsalis is caught in significant numbers in 50 and 60 mm mesh gillnets this species is unlikely to be exploited without harming exotic cichlids because sub-adults of exotic cichlids are also caught in these mesh sizes. The importance of gillnet selectivity studies of small indigenous cyprinids in Sri Lankan reservoirs is discussed.

[error in script]

Item Type:	Article
AGROVOC Term:	Cyprinidae
AGROVOC Term:	Fishes
AGROVOC Term:	Aquatic animals
AGROVOC Term:	Aquatic organisms
AGROVOC Term:	Gillnets
AGROVOC Term:	Puntius
AGROVOC Term:	Fisheries
AGROVOC Term:	Research
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:53
URI:	http://webagris.upm.edu.my/id/eprint/7838

Actions (login required)

View Item