Effect of stocking density on the survival rate and grow-out of blue swimming crab (Portunus pelagicus) in brackish water ponds

Restiana Ariyati, Sri Rejeki, R.H. Bosma, J.W. Schrama

Research output: Chapter in Book/Report/Conference proceedingAbstract

Abstract

Crabs only contribute a small percentage to Indonesia's total exports of aquaticproducts. Due to the growing popularity of the Blue swimming crab (Portunuspelagicus ), 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 oncauses and solutions for mortality as survival seems to be the most limiting factor for a feasible grow-out farming of Blue swimming crab.
Original languageEnglish
Title of host publicationBook of abstracts of the 12th Asian Fisheries & Aquaculture Forum (AFAF)
Subtitle of host publicationTransforming Asian Fisheries and Aquaculture for Sustainable Production and Nutrition
Pages76-76
Number of pages1
Publication statusPublished - 12 Apr 2019
Event12th Asian Fisheries & Aquaculture Forum (AFAF): Transforming Asian Fisheries and Aquaculture for Sustainable Production and Nutrition - Iloilo Convention Center, Iloilo, Philippines
Duration: 8 Apr 201912 Apr 2019
https://www.afsconferences.net/category/afaf/

Conference

Conference12th Asian Fisheries & Aquaculture Forum (AFAF)
CountryPhilippines
CityIloilo
Period8/04/1912/04/19
Internet address

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