The differences of depth on the species composition of spiny lobster puerulus on south Pacitan Regency East Java

Abstract

Lobster resources are one of renewable resources but if catches are increasing without any control will cause a depleted resource. Catching lobsters is not only in the adult phase but all phases are captured. The purpose of this study to determine the composition of lobster seeds between depths that have a high value of lobster seeds collection so that it can be used as a reference for lobster protection in nature. This research was conducted in January – February 2019, located in Pacitan district with the operational area in Wawaran beach waters. The statistical method used in this research was Chi-Square analysis and Kruskall-Wallis. Based on the results of the operation atracror puerulus lobster in two different depths (14 and 20 meters) in Wawaran beach waters found that there are four species puerulus, i.e., Panulirus homarus, Panulirus penicillatus, Panulirus ornatus and Panulirus versicolor. Its found that different depths did not affect the composition of the collected puerulus species. Then the Kruskal-Wallis test at 14 meters and 20 meters depth found a significant difference in the value of each type of lobster. The type of puerulus from Panulirus homarus has the dominant results compared than the other three species.

Carapace length-frequency distribution and carapace length-weight correlation of ornate spiny lobster (Panulirus ornatus) in Sebatik Island Waters – Indonesia

“…The growth pattern of ornate spiny lobster was negatively allometric, so carapace length increases faster than ornate spiny lobster weight. Negative allometric growth patterns of ornate spiny lobster in Sebatik Island waters is possible due to abiotic factors from a high level of pressure from the marine environment where they live, with dominant human activities, functional gonad maturity, and oceanographic processes 24,25 . As a comparison from other research on ornate spiny lobster growth patterns, data from Sorong waters shows a negative allometric pattern 26 .…”

“…The difference in b-value variance is affected by the dimensions of carapace length and weight levels of each species. Still, it may also be affected by several factors, such as food availability, water quality, sexual, gonad maturity level, and habitat well-being 24,25,27,28 .…”

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

“…Additionally, P. ornatus lobsters prefer rocky, shallow, and murky waters. (Saputra et al 2020;Setyanto et al 2018Setyanto et al , 2019Setyanto et al , 2020Setyanto et al , 2021 explained that the species has a critical economic value; therefore, management is needed to protect the sustainability of the species in Indonesian waters. The species has a relatively high economic value with a price of approximately IDR 600,000/kg, which increased to IDR 1,300,000/ kg in December 2021 due to a decrease in catches.…”