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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP
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    Abstract - Issue Jul 2016, 37 (4)                                     Back


nstantaneous and historical temperature effects on a-pinene

Reproductive biology of Nemipterus japonicus (Bloch, 1791) from the coastal waters of Bintulu (South China Sea), Sarawak, Malaysia 

 

T. Nettely1, A. H. Rajaee1, N.A. Denil1, M. H. Idris3, M. H. Nesarul1, S. M. Nurul Amin2 and M. K. Abu Hena1*

1Department of Animal Science and Fishery, Faculty of Agriculture and Food Sciences, Universiti Putra Malaysia Bintulu Sarawak Campus, 97008 Bintulu, Sarawak, Malaysia

2Department of Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

3School of Fisheries and Aquaculture Sciences, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu Darul Iman, Malaysia

*Corresponding Author E-mail: abuhena@upm.edu.my

 

 

 

Publication Data

Paper received:

07 May 2015

 

Revised received:

08 December 2015

 

Accepted:

09 April 2016

 

Abstract

Samples of threadfin breams Nemipterus japonicus were collected from a village in Kuala Nyalau and a fish landing centre at Bintulu from April 2013 to March 2014. A total of 360 individuals of N. japonicus (214 male and 146 female) were used in this reproductive study.? The total length (TL) of individuals were measured to the nearest 0.1 cm and body weight (BW) was recorded to the nearest 0.1 g. Month-wise distribution of the sexes was significantly higher for males in September and March, while in the month of May the number of females was significantly higher (X2 = 6.53; P < 0.05). Males showed a preponderance in the size-class of 19.0-20.9 cm (X2 = 80.24; P < 0.001), 21.0 -22.9 cm (X2 = 56.39; P < 0.001) and 23.0 -24.9 cm (X2 = 17; P < 0.001). The gonadosomatic index (GSI) values of N. japonicus ranged from 0.07 to 0.19 for males and 0.34 to 4.99 for females. Females had higher GSI than males throughout the study period. For males, a higher GSI (0.11-0.19) was observed during January to February, while it was found to be higher (2.73-4.99) for females during January to March, indicating the spawning season. The present study revealed that ovarian maturity based on histological analysis of N. japonicus was classified into seven stages namely, immature (I), immature (II), maturing (III), mature (IV), ripe (V), spawning (VI) and spent (VII). The fecundity of N. japonicus was estimated to be within a range of 19221 to 85923 with higher GSI (3.08-6.78) from the coastal waters of Bintulu, Sarawak.   

 

 

 Key words

Bintulu coast, Fecundity, Gonadosomatic index, Nemipterus japonicus, Reproductive biology

 

 

 

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