Reproductive biology of estuarine catfish, Arius argyropleuron (Siluriformes: Ariidae) in the northern part of Peninsular Malaysia

A preliminary study on reproductive biology of estuarine catfish, Arius argyropleuron was conducted using samples collected from Merbok estuary which is located in the northern part of peninsular Malaysia. The fish samples were collected in March-December 2009 using a barrier nets deployed on mudflat opposite vegetation of mangroves. Testes and ovaries were classified base on volume relative to abdominal cavity, gonad forms, size of gonad, colors and oocytes diameter. The gonado-somatic indices showed that the fish matured throughout the year with major spawning peak for females occurred in April and minor peak in July, whereas males recorded a higher peak in November. Absolute fecundity of mature ovary was ranged from 19 to 87 eggs and was linearly related to fish length and power function to fish body weight. Three groups of eggs for the ovary in stage II and two groups in stage III were recorded. The length at first maturity for both males and females was approximately 22.5 cm in fork length. Keywords: Arius argyropleuron, Merbok estuary, peninsular Malaysia, reproductive biolog

Length-weight Relationships of Some Important Estuarine Fish Species from Merbok Estuary, Kedah

Merbok estuary, located in the northern part of Peninsular Malaysia, was inhibited by 81 species that are representatives of 45 genera and 36 families of fish. The length-weight relationship of 23 fish species belonging to 18 families was presented. The b values varied between 2.7928 for Butis gymnopomus and 3.6001 for Sillago sihama. Nine species exhibited positive allometric growth, 10 species were negative allometric growth, 3 species had isometric growth and 1 species was Gompertz form of growth. The length-weight relationships for some species from the Merbok estuary are hereby publish for the first time, and most of the fish specimens were juveniles. Keywords: Estuarine fishes, length, weight, fisheries management, Merbok estuar

CHIRONOMIDS OF TROPICAL RICE FIELDS IN THE NORTH MALAYSIAN PENINSULA

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