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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Sep 2018, 39 (5)                                                                                                             Back



nstantaneous and historical temperature effects on a-pinene

Effects of bottom substratum on survival and growth of early juveniles of blue swimming crab, Portunus pelagicus

(Linnaeus, 1758) in captivity

 

S.M. Shoyaib Kohinoor1, A. Arshad1*, S.M. Nurul Amin1, M. Aminur Rahman2,3, Mohd. S. Kamarudin1 and J.A. Al Khayat4

1Department of Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia

2World Fisheries University Pilot Programme, Pukyong National University (PKNU), 45 Yongso-ro, Nam-gu, Busan 48513, Korea

3Laboratory of Marine Biotechnology, Institute of Bioscience, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia

4 Department of Biological and Environmental Sciences, College of Arts and Science, Qatar University, P.O. Box 2713, Doha, Qatar

*Corresponding Author E-mail: azizar.upm@gmail.com

 

 

 

Key words

Bottom substratum

Cannabalism

Captivity

Growth rate

Portunus pelagicus

 

 

 

Publication Data

Paper received : 25.05.2017

Revised received : 20.08.2017

Re-revised received : 15.10.2017

Accepted : 28.12.2017

 

Abstract

Aim: Cannibalism remains a limiting factor during the nursery culture of crabs. This study was undertaken to improve the rearing techniques by investigating the impact of bottom substratum on crablet survival and growth. The knowledge gained from the research will be useful for the communal seed culture and development of crab farming, which are important factors regarding farmers' job stability in the future.     

 

Methodology: Blue swimming crab, Portunus pelagicus (first settled (C1 crabs); initial average weight and SD of 0.02 0.01g) were cultured in glass aquarium (90 x 44 x 34 cm) and their survival and growth were assessed after 22 days of culture in four types of substratum such as control (none), sand, soil, or sand + soil. All treatments had 25 juvenile crabs, each of which was triplicated. Feeding was done twice a day (9 am and 5 pm) to apparent satiation.      

 

Results: Survival of early juvenile crabs cultured with sand was substantially higher at 65.33 6.11% than those cultured with soil, sand + soil or control at 29.33 10.07%, 28.00 8.00%, and 21.33 6.11%, respectively. Growth performance (such as final weight, weight gain and specific growth rate) of the early juvenile of P. pelagicus in all treatments were not significantly different (p>0.05).

 

Interpretation: Overall, the best survival was achieved with sand substratum and can be recommended as a mean of reducing cannibalism during the early nursery rearing of blue swimming crab juveniles under captive culture conditions.

 

 

 

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