Growth parameter, mortality, recruitment pattern, and exploitation rate of white shrimp Penaeus indicus in northern coastal waters of Western Central Java, Indonesia

Abstract

Abstract. Saputra SW, Solichin A, Taufani WT, Rudiyanti S, Widyorini N. 2019. Growth parameter, mortality, recruitment pattern, and exploitation rate of white shrimp Penaeus indicus on the northern coast of Central Java, Indonesia. Biodiversitas 20: 1318-1324. The aims of this study were to know the growth parameters, first lenght captured (Lc), mortality, recruitment pattern, and the exploitation rate of white shrimp (Penaeus indicus H.Milne Edwards, 1837) in the Western Coastal North Central Java Sea, Indonesia. Samples were collected from May 2016 to July 2017 using survey method and direct observations on fishing unit areas. The results showed that the relationship of the carapace length and weight is allometric. Based on the estimates of von Bertalanffy growth equation to the carapace length, the growth parameters of CL∞ and K values in male were 37 mm and 0.97, while in female were 38.5 mm and 0.85. While, the rates of total mortality (Z), natural mortality (M), and fishing mortality (F) were 3.5, 1.67, and 1.84 for males, and 5.03, 1.51, and 3.52 for females, respectively. The exploitation rate (E) of male shrimp was 0.52 and of female was 0.7 indicating that female shrimp get higher capture pressure than the males. It also showed that the rate of exploitation has to exceed the optimum sustainable yield (E>0.5). Time recruitment occurred throughout the year, with two peak seasons, i.e., in April-June and September-November. Moreover, the length of the carapace during recruitment was 15-20 mm. While the carapace length of the first caught (CL∞50) was 18.3 mm for male and 17.6 mm for female indicating that the P. indicus caught was still in the small size, as well as below the first mature gonad (CLm50 = 22-39 mm). This is because the mesh size of cod-end is 0.75 inches or about 2 cm.

Growth, mortality parameters and exploitation of the swimming crab Portunus trituberculatus (Miers, 1876) in the East China Sea

“…Studies had shown that E max as the biological reference standard might lead to overly optimistic assessments, while E 10 and 0.5 standards could balance the current catches and reasonable utilisation (Gulland and Oerema, 1973;Cook, 1998). The biological reference points E 10 or 0.5 had been adopted in other species such as Penaeus indicus (Saputra et al, 2019) and Penaeus merguensis (Saputra et al, 2018). The exploitation rates of female and male swimming crabs calculated in this study were 0.61and 0.62, respectively, which were higher than the optimal rates of E 10 and 0.5, but close to the E max .…”

Dynamics of White Shrimp Population (Penaeus merguiensis) in Karang Gading Deli Serdang Regency, as a Basis in Its Management Efforts

“…When viewed as a whole, there were two peaks of recruitment, namely in May and June at 18.92% and 18.33% respectively after four months of white shrimp spawning. [14] state condition will also lead to the depletion of shrimp parent stock, which automatically will result in a decrease in recruitment. This means that it will cause a decrease in stock which eventually will result in a decline in capture result per trip (CPUE).…”

Population of white shrimp (Penaeus merguiensis) in a mangrove ecosystem, Belawan, North Sumatra, Indonesia

“…Possible factors affecting the allometry growth including the physiological condition and environmental factors such as pH, salinity, seasonal variation, sex ratio, temperature, geographical locations and sampling technique (Anand et al 2014;Udoinyang et al 2016;Putra et al 2018). Other studies also reported the negative allometry growth of white shrimps in Egypt (Elganainy 2012), Persian Gulf (Momeni et al 2018), West Java (Saputra et al 2019). The relationship between carapace length and body mass of white shrimp is presented in Figure 5.…”