Abstract
Selectivity is a fishing gear characteristic capable of catching fish of a specific size and species from the existing population distribution. Mesh size is one of the important factors that influence gillnets’ selectivity, because different length-classes of fish are caught by them. This report focuses on the selectivity of two mesh sizes of gillnets (8.89 cm and 10.16 cm) on mackerel's catch and constructing a gillnet in Sungailiat waters. Experimental fishing methods and selectivity analysis were used for the fishing gear’s more selective preparation, if the largest fishing ratio's value at the fork length (L) is high and the standard deviation value (S) is closer to 1. It is concluded that to be more selective a largest S (L) value of 0.999267194 at fork length (L=54.95 cm), and with a larger value of S (L) 0.997096071 and with (L=66.55 cm) for mesh Sizes 8.89 cm and 10.16 cm, respectively.
Highlights
Fisheries play an important role in poverty alleviation, food security, nutrition supply, income, and in general to the community's socio-economic development (Mehanna et al, 2021b)
Selectivity of Drift Gillnet Mesh Size 8.89 cm and 10.16 cm was evaluated by using the data retrieval method on conducting live experiments on fish caught by gillnet drift fishing in the waters of Sungailiat, Bangka Belitung Province
Ballast in the form of a net-connected at the bottom of the body of the net of polyvinylidene chloride (PVDC) or so-called advice
Summary
Fisheries play an important role in poverty alleviation, food security, nutrition supply, income, and in general to the community's socio-economic development (Mehanna et al, 2021b). The selection of fish catches depends on the fish’s size rather than age This is because the fish's size determines the possibility of escaping through the eyes of the net or away from the fishing gear (Mehanna et al, 2021b). Selectivity is the fishing gear's nature that catches fish of a specific size and population distribution species (Lagler, 1978). This property mainly depends on the principle used in the capture and the design parameters of fishing equipment, such as mesh size of nets, materials and thread sizes, hanging ratio, and attractive speed (Tambunan and Agustriani, 2010). The selectivity of size, and death of fish are influenced by the size and design of the fishing rod (Forster, 1973; Anon, 1983; Skeide et al, 1986; Bjordal and Løkkeborg, 1996)
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