POPULATION DYNAMICS OF THE THREE-SPOT SWIMMING CRAB (PORTUNUS SANGUINOLENTUS) IN PATI WATERS, CENTRAL JAVA
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exploitation rate, growth, mortality, population dynamic, Portunus sanguinolentus
Abstract
Currently, Portunus sanguinolentus is one of the fishery commodities that has experienced a decline in population due to exploitation pressures and habitat or environmental damage. This has an impact on changes in the population structure and reproductive strategy of P. sanguinolentus, with parameters that can change, among others, the size of the first gonad becoming smaller, changes in spawning areas and seasons, and changes in the balance of the sex ratio. This study aims to determine the population dynamics of P. sanguinolentus in Pati Regency, Central Java, and whether it is useful for the processing industry to make a new product. Data and information were obtained through observation, interviews, and enumeration, which were carried out at each fish landing site. Collecting data from catches in fishing areas below 12 miles with a maximum depth of 15 m for 5 months. The FISAT II software was used to analyze the growth parameters, mortality rate, and exploitation rate. Obtained weight data of 7.72 kg with a total sample of 107 ind. Detailed data were obtained for 46 females with an average width of 106.24 mm and 61 males with a width of 103.95 mm, and the average weight of the entire sample was 74.26 g.
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