Some Biological Aspects Of Gerres Filamentosus (Cuvier, 1829) In Merbok Estuary, Kedah, Peninsular Malaysia
Some biological aspects of Gerres filamentosus in Merbok estuary were studied from January to December 2011 using samples from monthly catches. Each sample consists of 50-100 fishes which varied from the smallest (10.1 cm) to the largest (18.3 cm) sizes. The length-weight relationship was anal...
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| Format: | Thesis |
| Language: | English |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://eprints.usm.my/43908/1/Nurul%20Shafikah%20Binti%20Mohd%20Noor24.pdf |
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| Summary: | Some biological aspects of Gerres filamentosus in Merbok estuary were studied from
January to December 2011 using samples from monthly catches. Each sample
consists of 50-100 fishes which varied from the smallest (10.1 cm) to the largest
(18.3 cm) sizes. The length-weight relationship was analyzed for G. filamentosus by
substituting the fish length and weight values into W=aLb. The calculated lengthweight
relationships of W=0.011L3.154 and W=0.013L3.103 , obtained from female and
male respectively. The exponent value, b = 3.154 for female and b = 3.103 for male
showed that both male and female of G. filamentosus had positive allometric growth.
Besides, the relative condition factor (Kn) obtained was 0.999±0.074SD and
1.002±0.080SD for female and male, had revealed that male had a better condition
than female, at the same time proved that Merbok estuary was in good ambience for
survival and favorable for this species. Moreover, the sex ratio was found to be
1:1.45 (male:female). The reproductive cycle of this species was analyzed using the
gonadosomatic index, through macroscopic observation and histological method.
The maturity stages of male and female G.filamentosus were classified into four
stages of testes and five stages of ovary. Herein, G. filamentosus spawn throughout
the year with two spawning peaks, one in October 2011 and the second one in
February 2011, which coincided with the primary maximum (September to
November) and primary minimum (January to February) of rainfall. |
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