POPULATION CHARACTERISTICS OF MUD CRAB (Scylla serrata) IN THE WATERS OF KENDARI BAY AND SURROUNDING AREAS

Abstract

The high market demand for mud crabs (Scylla serrata) has caused intensive fishing for this resources and tended to threaten their sustainability. Studies of population characteristics are the main bases for formulating management measures for sustainable utilization. The purpose of this study was to determine the population characteristics of mud crabs in the waters of Kendari Bay and its surrounding waters. The study was conducted from January to November 2016 using survey method. The study results revealed that the mud crab growth pattern in Kendari Bay was negative allometric and that the ratio of males and females was imbalance. The length at first maturity (Lm) was at a carapace width of 109.8 mm. The growth rate (K) was 1.01 per year and the maximum carapace width (L) was 206 mm. The estimated total mortality rate (Z), fishing mortality rate (F), and natural mortality rate (M) were 3.20 per year, 2.17 per year, and 1.03 per year, respectively. The exploitation rate (E) was 0.68 per year. Therefore, the exploitation rate had reached 136%, which is categorized as overfishing. In order to ensure the sustainability of the mud crabs, there is needed to apply the precautionary approach, such as reducing fishing effort by 36% of the current situation.

Growth analysis, mortality and exploitation level of Mud Crab Scylla serrata, Forskål 1775, (Malacostraca : Portunidae) in Mangkang Wetan waters, Semarang, Central Java, Indonesia

“…This is also expressed that the increment of crab carapace width is faster than the weight increment. The results of this study are in agreement with research by Tetelpta et al (2017) and Suman et al (2018) in Indonesia as well as Atagholipour et al (2013) in Oman that the growth pattern of S. serrata is negative allometric.…”

“…Research has been conducted by Moksnes et al (2014) in East Africa, Amarasekara et al, (2016) in Sri Lanka, and Gonzales et al, (2018) in the Philippines. Whereas in Indonesia, similar research was conducted by Sara (2010) in Lawele Bay, Tetelpta et al (2017) in West Seram, and Suman et al (2018) in Kendari Bay. Study related to the same classes Malacostraca (Portunus pelagicus) in northern part of Java Sea were also reported by Maghfirani et al (2019), Wibowo et al (2019) in Rembang waters.…”

“…As seen in Table 4, differences in growth parameters in various locations may due to the differences at the maximum length of samples collected and differences in waters location (Suman et al, 2018). Although growth parameters vary according to regions, environmental factors such as food availability, water temperature, and salinity can affect the growth rate (Sara, 2010).…”

Effects of soil trace metals, organic carbon load and physicochemical stressors on active oxygen species metabolism in Scylla serrata sampled along the Bay of Bengal in Odisha state, India

“…Several studies indicate that environmental factors may cause the production of free radicals (pro-oxidants) in the aerobes that can damage all macromolecules such as protein, lipid, and nucleic acids, leading to a physiological state called OS (Wells et al, 1993;Beyer, 1994;Cohen et al, 1996;UH and Bhattacharya, 2006;Alves de Almeida et al, 2007;Marxen et al, 2007;Mamun et al, 2008;Monteiro et al, 2009;Shen et al, 2011;Fu et al, 2013;Liu et al, 2013;Paital, 2014;Paul et al, 2015;Yesaki and Iwama, 2015;Rivera-Ingraham et al, 2016;Deng et al, 2017;González Durán et al, 2018;Suman et al, 2018;Copatti et al, 2019;. When electrons are leaked and it increases during their flow via electron transport complex enzymes, especially at the complex I, III and IV, it leads to the incomplete reduction of oxygen (Giraud-Billoud et al, 2019).…”

Population dynamics of mud crab, Scylla olivacea (Herbst, 1796) from the Sundarbans of Bangladesh

“…As mentioned, the exploitation rate of female mud crabs was 0.44, which was close enough to 0.50 (Table 2). Generally, female mud crabs also have a high demand in the local market as an input for crab fattening, soft‐shell farming, and direct export to foreign markets (Hoq, 2007; Rivera et al., 2017; Suman et al., 2018; Wu et al., 2020). Crab harvesters are quite choosy about colleting immature female crabs from the mangrove regions.…”