Growth, Mortality, and Exploitation Rate of Penaeus merguensis in the North Coast of Central Java, Indonesia

Abstract

One of the most-caught shrimp in north coast of Central Java is Penaeus merguiensis. However, little is known on the population biology of the organisms. This study was aimed to investigate length-weight relationship, growth, length at first capture (Lc50), mortality rate, and exploitation rate of P. merguiensis in Western part of Central Java’s northern coastal waters. The study was conducted from May 2016 to July 2017 using survey method. Samples were taken for 15 times (month) from 9 coastal fishing ports. The result shows that the relationship of the carapace length and weight is negative allometry. The growth parameters of CL∞ and K were 52.5mm and 1.3 y-1 (male) and 57.25mm and 1.2 y-1 (female). Total mortality rate (Z), natural mortality rate (M), and fishing mortality rate (F) were 4.51 y-1, 1.86 y-1 and 2.65 y-1 (male), and 5.36 y-1, 1.72 y-1, and 3.64 y-1 (female), respectively. The exploitation rate (E) of male banana shrimp was 0.59, and for female shrimp was 0.68. The result shows that the exploitation level has exceeded the optimum level (E>0.5). Recruitment of P. merguiensis may occur the whole year, but it peaks were in March and August (male), April and August (female). Carapace length of first captured (CLc50) was 20.63mm (male) and 18.28mm (female). It means that the sized of captured P. merguiensis is less than the size of first mature (CLm50) or growth overfishing and as a result, disrupting the availability of adult shrimp. The condition occurs due to the size of cod-end mesh measured 0.75inc.

Variation in size distribution of juvenile pink shrimps Farfantepenaeus brasiliensis and F. paulensis in the estuarine-adjacent ocean area of Cananéia, south-eastern coast of Brazil

“…This inverse tendency between the growth parameters CL ∞ and k observed in the present study was also registered for other peneids, e.g. F. subtilis (Santos et al, 2020), Litopenaeus schmitti (Burkenroad, 1936) (Lopes, 2012;Santos et al, 2020), Rimapenaeus constrictus (Stimpson, 1874) (Garcia et al, 2016), Penaeus merguiensis de Man, 1888 (Saputra et al, 2018), Parapenaeus fissuroides Crosnier, 1985 (Farhana & Ohtomi, 2017) and X. kroyeri (Castilho et al, 2015). The longevity estimated for both species was around 2-3 years and females showed higher values in relation to males, which was similar to observations of other authors (Villela et al, 1997;Peixoto et al, 2001;Neto, 2011;Lopes, 2012).…”

“…This inverse tendency between the growth parameters CL ∞ and k observed in the present study was also registered for other peneids, e.g. F. subtilis (Santos et al ., 2020), Litopenaeus schmitti (Burkenroad, 1936) (Lopes, 2012; Santos et al ., 2020), Rimapenaeus constrictus (Stimpson, 1874) (Garcia et al ., 2016), Penaeus merguiensis de Man, 1888 (Saputra et al ., 2018), Parapenaeus fissuroides Crosnier, 1985 (Farhana & Ohtomi, 2017) and X. kroyeri (Castilho et al ., 2015).…”

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

“…Accordingly, the value of L ∞ is bigger [11]. Natural mortality( M) of adult fish isn't generally controlled by fisheries operation conduct, but the position of natural mortality is important for establishing crop criteria [12].…”