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The effect of ice trash fish, Leiognathus equula (Forsskål, 1775) (Percomorphi, Leiognathidae) and oyster, Crassostrea iredalei (Faustino, 1932) (Ostreida, Ostreidae) on the growth and mating of the mud crab, Scylla paramamosain Estampador, 1950 (Brachyura, Portunidae), cultured in a controlled tank

In: Crustaceana
Authors:
Gunarto Gunarto Department of Fish Biotechnology, Genetics and Seed Production, Research Institute for Brackish Water Aquaculture and Fisheries Extension, Maros 90512, South Sulawesi, Indonesia
Research Center for Fishery, National Research and Innovation Agency, Cibinong, Bogor, West Java, Indonesia

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Herlinah Herlinah Department of Fish Biotechnology, Genetics and Seed Production, Research Institute for Brackish Water Aquaculture and Fisheries Extension, Maros 90512, South Sulawesi, Indonesia
Research Center for Fishery, National Research and Innovation Agency, Cibinong, Bogor, West Java, Indonesia

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Muliani Muliani Research Center for Fishery, National Research and Innovation Agency, Cibinong, Bogor, West Java, Indonesia
Department of Fish and Environmental Health, Research Institute for Brackish Water Aquaculture and Fisheries Extension, Maros 90512, South Sulawesi, Indonesia

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Bunga Rante Tampangallo Research Center for Fishery, National Research and Innovation Agency, Cibinong, Bogor, West Java, Indonesia
Department of Fish and Environmental Health, Research Institute for Brackish Water Aquaculture and Fisheries Extension, Maros 90512, South Sulawesi, Indonesia

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Kamaruddin Kamaruddin Research Center for Fishery, National Research and Innovation Agency, Cibinong, Bogor, West Java, Indonesia
Department of Fish Nutrition, Research Institute for Brackish Water Aquaculture and Fisheries Extension, Maros 90512, South Sulawesi, Indonesia

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Abstract

The aim of this study was to determine the most suitable kind of feed for the mud crab, Scylla paramamosain, to grow from juvenile to broodstock size and to monitor their monthly size and growth rate, as well as to (1) record them reaching maturity and (2) their subsequent mating frequency. For this research, a Complete Randomized Design was used with three treatments. Each treatment was carried out with 40 individuals. The crabs are usually grown in 90 m3 concrete tanks. The three feeds tested were: (A) trash fish, Leiognathus equula, (B) a combination of that ice trash fish and oyster meat from Crassostrea iredalei, and, (C) that same oyster meat only. The feed was always given at 3-10% of total body weight/day. Newly adult male crabs were selected for mating with a newly adult female crab. The male crabs fed treatments B and C grew faster than male crabs fed treatment A. While the female crabs fed treatment C grew significantly faster than female crabs fed treatment A ( p < 0.05), but not significantly than the female crabs fed treatment B ( p > 0.05). A total of 30 female crabs were followed in mating from July 2020 to January 2021, and the highest mating intensity was found from September to October 2020. The present study indicates that mud crabs grow fast when they are fed treatment C, i.e., oyster meat only.

Résumé

Cette étude cherche à déterminer le type de nourriture la plus adaptée pour le crabe des palétuviers, Scylla paramamosain, pour la croissance des juvéniles jusqu’à la taille de reproduction, suivre leur croissance mensuelle et le taux de croissance, et noter (1) Le moment de la maturité et (2) la fréquence des accouplements. Pour cette recherche, un protocole aléatoire complet a été utilisé avec trois traitements, chaque traitement comportant 40 individus dans des bacs en ciment de 90 m3. Les trois régimes testées ont été : (A) le poisson-poubelle Leiognathus equula, (B) un mélange de poisson-poubelle et de chair d’huître Crassostrea iredalei, et (C) la chair de la même huître seule. La nourriture a été donnée à un taux de 3-10% par poids corporel par jour−1. Les nouveaux crabes mâles adultes ont été sélectionnés pour l’accouplement avec les nouvelles femelles adultes. Les mâles nourris avec les régimes B et C ont grandi plus vite que les mâles avec le régime A. Alors que les crabes femelles nourries avec le régime C ont grandi significativement plus vite que les femelles nourries avec le régime A ( p < 0 , 05), mais pas significativement plus que les femelles nourries avec le régime B ( p > 0 , 05). Un total de 30 crabes femelles a été observé en accouplement de juillet 2020 à janvier 2021, et la plus forte intensité d’accouplement a été en septembre-octobre 2020. Cette étude indique que le crabe des palétuviers croît plus vite quand il est nourri avec le régime C, i.e., la chair d’huître seule.

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