Effect of Modified Scoop Net Design and Optimal Fishing Time on Catch Weight and Species Composition in the Morosari River Mouth
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Abstract
Scoop nets are widely used in small-scale fisheries, but their efficiency can be limited by timing and design constraints. To address these limitations, the research aimed to determine the best fishing time for using the scoop net and to demonstrate that adding a pocket to the scoop net can increase the catch weight without affecting the species composition. The construction of a standard scoop net is generally similar to that of a lift net. Its main component consists of a piece of net measuring 4×4 m that can be lowered and lifted in the water. The modified scoop net, however, is equipped with a pocket in the center of the net. In the current study, both types of scoop nets were operated simultaneously at locations approximately 20 m apart. The results showed that the best fishing time for the scoop net was between 12:00 p.m. and 04:00 p.m. (GMT +7), yielding 139.66 kg of fish, or 78.87% of the total catch. The modified scoop net caught five species of fish: spot mullet (Moolgarda seheli), barramundi (Lates calcarifer), tiger tooth croaker (Otolithes ruber), spotted scat fish (Scatophagus argus), and long whiskers catfish (Mystus gulio). The standard scoop net caught four of the same species, except for barramundi. The additional pocket reduced the drag force of the modified scoop net to 0.973 kgf, which was 75% of the drag force of the standard scoop net (1.296 kgf). Moreover, the additional pocket of the modified scoop net resulted in a total catch of 147.65 kg of catch, which is 5.02 times the catch weight of the standard scoop net (29.42 kg).
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