Reproductive Biology of Coral Catshark Atelomycterus marmoratus (Anonymous [Bennett], 1830) in Seribu Islands, Indonesia

Abstract

This study provides information on the reproductive biology of the coral catshark caught in the waters around Seribu Islands, Indonesia. A total of 257 coral catsharks were collected from February 2017 to January 2018. The total length of coral catshark ranged from 170 to 585 mm for females and 255-575 mm for males, respectively. The total weight of females ranged from 85 to 640 g and males from 100 to 620 g The sex ratio between females and males was 0.45 and it was not significantly different from the expected 1:1 ratio. The growth pattern of coral catsharks in Seribu Island was negatively allometric and the population was dominated by mature sharks. The mean size at first maturity was estimated to be 557 mm for females and 514 mm for males, based on to the relationship between the proportion between maturity stage and total length. The ovulation season was estimated occur from October to March, whereas September to April was mating season based on monthly variations of gonadosomatic index (GSI) values and the occurrence of egg cases in uterus.

Description of the egg cases and juvenile colouration in two catsharks of the genus Atelomycterus (Carcharhiniformes: Scyliorhinidae)

“…No seasonality of laying was observed for captive females probably due to the absence of seasonal cues experienced in an aquarium environment. This contrasts with wild A. marmoratus females which were found to contain egg cases mostly during March and September, displaying breeding seasonality (Oktaviyani et al ., 2019).…”

Species, Conservation Status, and Reproductive Biology of Rays (Batoidea) Caught by Purse Seine in Bali Strait, Indonesia

“…However, the Dasyatidae family became a group of Batoidea which landed dominantly in Muncar and similar to the other CFP in those areas. Dasyatidae is very common and has a high abundance of species diversity [5,19]. The difference in species diversity can be affected by several factors, including the types of fishing areas or waters, the length of the research time, the fishing gears used, and the fishing seasons.…”

“…VU status is given to species that are certain to face extinction in nature in the future. Apart from their reproductive biology, these species fall into the VU category due to massive use and exploitation so that, in nature, they experience a sharp decline [5,21].…”

“…The formula for determining the weight and width relationship can be analyzed based on the equation as follows [16]: (5) where: Wweight; Lwidth; aintercept; bconstant.…”

“…Muncar CFP is located in the Indonesian Fisheries Management Area (FMA) 713 in the waters of the Bali Strait. The fishing area of Muncar CFP is vast and can still be used [5].…”