Growth Patterns and Mortality of Lobster Panulirus ornatus from the Catch of Bottom Gill Net Fishers in the Western Waters of Tarakan Island

Abstract

Large-bodied Panulirus ornatus lobsters are economically important because they are an aquatic biota. It is one of the most important commodities in the city of Tarakan. The aim is to analyze the growth patterns and mortality of P. ornatus from the West Waters of Tarakan City. Method using a quantitative descriptive. The purposive sampling method was used by dragging the gill net fishing gear to the P. ornatus lobster ground area, and the collection was carried out 16 times in 7 months (December 2021-July 2022). The results of P. ornatus showed that the male sex ratio was higher than the female. The growth model was allometrically negative, and the criteria for the condition index were fat and thin. The growth pattern of Model Von Bertalanffy males is slower than females. However, the growth rate to achieve asymptotic growth for males is faster than for females. The total mortality, catch mortality, and exploitation rate of males was higher than females. However, the mortality of the female nature was higher than that of males. P. ornatus should be managed in the waters of West Tarakan using the domestication and restocking technique to increase sustainability.

Growth and mortality model of Chacunda gizzard shad Anodontostoma chacunda (Bleeker, 1852) in Tarakan waters, North Kalimantan, Indonesia

“…Data analysis of A. chacunda using the growth parameter model consists of various variables: length distribution, growth pattern, condition factor, growth parameters, and mortality parameters. According to Salim et al (2022) and (Indarjo et al 2021;2023a), in determining the growth model parameters using total length data, total weight, and sex with a total of 789 individuals, consisting of 463 males and 326 females. Variable mortality model in A. chacunda fish using natural mortality model variables, fishing mortality model, total mortality model, and exploitation rate model according to Salim et al (2022) and Indarjo et al (2020b;.…”

“…Indonesian waters, with their expansive area, harbor a diverse array of biological resources (that can enhance the local community's economic income) (Hasan and Widodo 2021;Indarjo et al 2022;Hasan et al 2022;Meiryani et al 2023;Serdiati et al 2023), both domestically and internationally (Gani et al 2021;Ndobe et al 2023;Indarjo et al 2022;Hasan et al 2023;Nurjirana et al 2023). This condition also applies to the waters of Tarakan Island (Indarjo et al 2023a). Administratively, Tarakan is a city area geographically covering 657.33 km 2 , located at coordinates 3°19'-3°20'N and 117°34'-117°38'E (Central Agency of Statistics Tarakan 2021), with a marine area of about 406.53 km 2 (62%) and a land area of approximately 250.8 km 2 (38%) (The Audit Board of The Republic of Indonesia 2022).…”

“…According to Salim et al (2023a) explained that the index condition is still related to the length-weight relationship with the regression equation and b value. The results of research on the growth pattern of male and female fish have a negative allometric growth pattern.…”

“…Ecologically, Tarakan boasts a diverse range of coastal ecosystems (Dau et al 2023), beach ecosystems, marine ecosystems, mangrove ecosystems (Zheng et al 2023), and estuarine ecosystems (Salim et al 2020a). Tarakan's waters are part of the estuarine ecosystem category, with a salinity range of about 15-18 ppt (Indarjo et al 2023a). Nevertheless, this region is known for its abundant biological resources (Salim et al 2022).…”

Growth pattern and the condition index of nomei fish Harpodon nehereus captured with mini-trawl in Tarakan Waters

“…Condition indexs of the H. nehereus was grouped into five categories i.e. very thin (0.01-0.50), thin (0.51-0.99), proportional/ideal (1), fat (1.01-1.50), and the very fat (>1.50) [10]; [11]; [12]; [13]; [14]; [15]. Meanwhile the allometric growth and the isometric growth were analyzed based the methods suggested by [16] and [17], respectively.…”