The Composition, Size Distribution and Growth Patterns of Penaeus monodon and Penaeus merguiensis at the Estuary of Tukad Aya, Jembrana Bali

Abstract

Estuary ecosystem has an important role in supporting the life of shrimp. High productivity and the availability of natural food in the estuary ecosystem, will indirectly affect the growth of shrimp. Penaeus monodon and Penaeus merguiensis were two species of shrimp that had economic value with high demand. The purpose of this study was to determine the biological aspects of Penaeus monodon and Penaeus merguiensis shrimp at estuary of Tukad Aya, Bali. Data collection was carried out in February-March 2019 using quantitative descriptive research methods. The determination of the research station was done by purposive sampling. The results showed the total number of shrimps were caught 1,756 individuals, which consist of Penaeus monodon 151 individuals, Penaeus merguiensis 224 individuals and 1,325 individuals of other shrimp. The composition of Penaeus monodon (8.6%) was less than Penaeus merguiensis (12.76%). Shrimp length measurements were divided into 9 groups with a range of values of 55.15-189.95 mm in Penaeus monodon and 31.3-140.1 mm in Penaeus merguiensis. The results of the length and the weight regression in both species of shrimp obtained the value of b <3 so that the growth pattern of shrimp was categorized as negative allometric where length growth was faster than weight gain.

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

“…Group distribution patterns are most commonly found in populations in nature because P. merguiensis tends to look for suitable habitats such as rich of nutrient sources and other physicochemical factors suitable to support the lives of the individuals. White shrimps were generally harvested in shallow waters and in areas where seawater and freshwater are mixed because in these areas, there are many sources of nutrients in the form of detritus and zooplankton for white shrimp [8,9]also stated that shrimps living in the coastal ecosystem were generally grouped in the pattern due to the synergy of sexual maturity. [10] state that if the value of b = 3 isometric growth or carapace length increase is equal to the weight gain, while when the value of b is greater or smaller than 3, the growth is said to be allometric or the increase in carapace length is not the same as the weight gain.…”

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

“…Therefore, it is necessary to gain some biological information on the shrimp density in the area following the assessment on the physicochemical factors that may affect the shrimp population. Studies on the bioecological aspect of white shrimp have been conducted in several regions in Indonesia, such as Karang Gading (Mulya and Yunasfi 2018), Langsa (Damora et al 2019), and Bali (Siagian et al 2020). The results of this study provide information on the current status of the white shrimp population in North Sumatra, Indonesia and establish baseline data for the sustainable management effort of white shrimp resources in the waters of the Belawan mangrove ecosystem and its surroundings.…”

“…White shrimps were generally harvested in shallow waters and in areas where seawater and freshwater are mixed because in these areas, there are many sources of nutrients in the form of detritus and zooplankton for white shrimp. Siagian et al (2020) also reported that the crustaceans living in the coastal ecosystem were generally clumped in the pattern due to the synergy of sexual maturity.…”

“…The results also demonstrated that the estuary area of Belawan mangrove ecosystem might not be suitable for the population of mature white shrimps. Siagian et al (2020) stated that the estuary area was utilized as a nursery and feeding ground for shrimp. Shrimp larvae will migrate to rearing areas in coastal waters close to the estuary until reaching sexual maturity.…”