Length-based stock assessment of Smith's Barb Puntioplites proctozystron (Bleeker 1865) (Cyprinidae) and Asian redtail catfish Hemibagrus nemurus (Valenciennes 1840) (Bagridae) in a multipurpose reservoir in Thailand

Noranarttragoon Pavarot, . and Charernnate Kajitpan, . and Jutagate Tuantong, . Length-based stock assessment of Smith's Barb Puntioplites proctozystron (Bleeker 1865) (Cyprinidae) and Asian redtail catfish Hemibagrus nemurus (Valenciennes 1840) (Bagridae) in a multipurpose reservoir in Thailand. pp. 159-167. ISSN 0116-6514

Catches from inland fisheries in Thailand are about 200 000 tonnes annually and plays an important role in food security and subsidiary income. However fish stocks are seldom assessed because of the lack of catch and effort data. In this study two fish stock assessment models viz. relative yield per recruit and length-based spawning potential ratio were used to evaluate the status of two species as well as to highlight their applications to datalimited situation in Thailand. The study was conducted at Kangkrajan Reservoir Thailand for two targeted species viz. Smith's barb Puntioplites proctozystron (Bleeker 1865) and Asian redtail catfish Hemibagrus nemurus (Valenciennes 1840) using length frequency data. The data were collected throughout 2019. Both species showed isometric growth. Von Bertalanffy growth parameters were estimated. Asymptotic length curvature parameter and theoretical age at length zero were 36.2 cm TL 0.39 yr- and -0.28 yr for P. proctozystron respectively and 63.2 cm TL 0.37 yr- and -0.32 yr for H. nemurus. The exploitation rates reveal that both species are slightly overfished. Sizes at 50 maturity and 50 selectivities were 17.8 and 23.5 cm TL for P. proctozystron respectively and 15.6 and 20.8 cm TL for H. nemurus. Considering both parameters the size at first capture to sustain the fisheries of P. proctozystron and H. nemurus should be 18 cm and 30 cm respectively which can be achieved by mesh-size regulations.

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Abstract

Catches from inland fisheries in Thailand are about 200 000 tonnes annually and plays an important role in food security and subsidiary income. However fish stocks are seldom assessed because of the lack of catch and effort data. In this study two fish stock assessment models viz. relative yield per recruit and length-based spawning potential ratio were used to evaluate the status of two species as well as to highlight their applications to datalimited situation in Thailand. The study was conducted at Kangkrajan Reservoir Thailand for two targeted species viz. Smith's barb Puntioplites proctozystron (Bleeker 1865) and Asian redtail catfish Hemibagrus nemurus (Valenciennes 1840) using length frequency data. The data were collected throughout 2019. Both species showed isometric growth. Von Bertalanffy growth parameters were estimated. Asymptotic length curvature parameter and theoretical age at length zero were 36.2 cm TL 0.39 yr- and -0.28 yr for P. proctozystron respectively and 63.2 cm TL 0.37 yr- and -0.32 yr for H. nemurus. The exploitation rates reveal that both species are slightly overfished. Sizes at 50 maturity and 50 selectivities were 17.8 and 23.5 cm TL for P. proctozystron respectively and 15.6 and 20.8 cm TL for H. nemurus. Considering both parameters the size at first capture to sustain the fisheries of P. proctozystron and H. nemurus should be 18 cm and 30 cm respectively which can be achieved by mesh-size regulations.

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Item Type:	Article
AGROVOC Term:	Cyprinidae
AGROVOC Term:	Bagridae
AGROVOC Term:	Reservoirs
AGROVOC Term:	Sampling
AGROVOC Term:	analysis
AGROVOC Term:	Fishery management
AGROVOC Term:	Growth
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:55
URI:	http://webagris.upm.edu.my/id/eprint/9894

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