Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 558654
Title Effect of stocking density on the survival rate and grow-out of blue swimming crab (Portunus pelagicus) in brackish water ponds
Author(s) Wisnu Ariyati, Restiana; Rejeki, Sri; Bosma, Roel; Schrama, Johan
Event 12th Asian Fisheries & Aquaculture Forum (AFAF), Iloilo, 2019-04-08/2019-04-12
Department(s) Aquaculture and Fisheries
WIAS
Publication type Unpublished lecture
Publication year 2019
Abstract Crabs only contribute a small percentage to Indonesia's total exports of aquatic products. Due to the growing popularity of the Blue swimming crab (Portunus pelagicus ), fishery catches of this species have increased since the early 1950s. This increased fishing pressure has led to a decline in the P. pelagicus population in Southeast Asian countries such as Thailand, Philippines, Vietnam and Indonesia. As a result, fishermen hardly catch large crab, and market also juveniles. Juvenile crabs are usually sold at lower prices; therefore, fattening small crab to market size may have a future. Furthermore, fattening to marketable size for an acceptable cost and effort might also reduce the fishing pressure. This study aimed to determine the optimal stocking density of Blue swimming crab for rearing in cages in shallow brackish water ponds. The research was conducted at Tambakbulusan village, Demak, Central Java, Indonesia. In a pond with 0.5 meter water depth we suspended 20 cages of 2.5 x 2 meter, for a Randomized Block Design of 4 stocking densities (2, 3, 4, and 5 individual's m-2) in five replications. Sea weed was added as shelter. The initial average size of these crabs was 5+1.6 cm in carapace length and 20+1.5 g in body weight. The crabs were fed trash-fish twice a day at a total dosage of 5 % of body weight; the quantity was adjusted bi-weekly after measuring and weighing all individuals. The effect of stocking density on the growth was not significantly different (P>0.05) but the survival rate was (P<0.05). Lowest densities (2 individual's m-2) resulted in highest survival rate (50 %). Research is needed on causes and solutions for mortality as survival seems to be the most limiting factor for a feasible grow-out farming of Blue swimming crab.
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