Catch Composition, Size and CPUE of Spiny Lobsters in Bottom Gillnet Fisheries from Two Distinct Fishing Grounds in Koh Pu, Krabi Province, Southern Thailand
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Abstract
This study aimed to assess the catch composition, size, and catch per unit effort (CPUE) of spiny lobsters in two distinct fishing grounds: a seagrass bed (FG1) and an artificial reef area (FG2), using bottom gillnets operated by small-scale fishers in Koh Pu, Krabi Province, Southern Thailand. Data were collected monthly from September 2022 to February 2023 through onboard surveys conducted with two study boats, one assigned to each fishing ground. Over the six-month period, bottom gillnet fishing was conducted 12.2±4.8 and 13.0±2.6 times per month in FG1 and FG2, respectively. The analysis revealed that two lobster species (Panulirus polyphagus and P. ornatus) were present in FG1, while three species (P. polyphagus, P. ornatus, and P. versicolor) were found in FG2. The mean caught weight and body weight (BW) of spiny lobsters were 1,400.0±1,106.8 g·month⁻¹ and 538.5±150.2 g BW in FG1, and 3,033.3±665.8 g·month⁻¹ and 650.0±165.3 g BW in FG2. No significant differences in lobster CPUE were observed between FG1 (58.3±46.1 g·h⁻¹) and FG2 (126.4±27.7 g·h⁻¹), and the water quality parameters (salinity, pH, dissolved oxygen, and water temperature) did not differ significantly between the two fishing grounds. This study indicated that neither fishing ground in the Koh Pu area significantly affected the monthly catch or CPUE of spiny lobsters. Additionally, these areas are considered important areas for spiny lobster fishing.
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