Reproductive Biology of Short Mackerel Rastrelliger Brachysoma (Bleeker, 1851) and Indian Mackerel R

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2 Reproductive Biology of Short Mackerel Rastrelliger brachysoma (Bleeker, 1851) and Indian Mackerel R. kanagurta (Cuvier, 1816) in Thai Waters 1* 2 1 3 Tassapon Krajangdara Patcharee Puntuleng Panida Chalee and Piyawan Hussadee 1 Andaman Sea Fisheries Research and Development Center (Phuket) 2 Chumphon Marine Fisheries Research and Development Center (Chumphon) 3 Upper Gulf Marine Fisheries Research and Development Center (Samutprakarn) Abstract Reproductive biology of short mackerel, Rastrelliger brachysoma and Indian mackerel, R. kanagurta were studied in Thai Waters from October 2003 to September 2005. The data was collected from purse seiners, trawlers and gill neters, which landed at fishing ports around the Andaman Sea, the upper and middle Gulf of Thailand. The results showed the relationship between total length and body weight of R. brachysoma (TL 11-24 cm) were W = 0.0142 TL2.9402 and W = 0.0074 TL3.1670 while those of R. kanagurta (TL 12-29 cm) were W = 0.0145 TL2.9350 and W = 0.0072 TL3.1521, respectively. Both species of fish spawned all year round and spawned highly in 2 phases. R. brachysoma in the Andaman Sea spawned during November-May and July-September, while in the Gulf of Thailand they spawned during February-May and July-October and R. kanagurta in the Andaman Sea spawned during December-March and August-September, while in the Gulf of Thailand they spawned during January-March, May, July, September and November. The average size at first maturity of male and female of R. brachysoma in the Andaman Sea were 16.09 and 15.33 cm; in the Gulf of Thailand were 16.45 and 17.95 cm while those of R. kanagurta in the Andaman Sea were 17.83 and 18.92 cm; in the Gulf of Thailand were 20.07 and 17.12 cm, respectively. Sex ratio of male : female of R. brachysoma was 1 : 0.85 and 1 : 1.19, while sex ratio of male : female of R. kanagurta was 1 : 0.91 and 1 : 1.31. Key words: reproductive biology, short mackerel, Indian mackerel, Rastrelliger brachysoma, R. kanagurta, Thai Waters _______________________________________ * Corresponding author: 77 Sakdidej Road, Muang District, Phuket Province 83000 Thailand. e-mail : [email protected] .

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LEVELS in INDIAN MACKEREL Rastrelliger Kanagurta (SCOMBRIDAE) from KARACHI FISH HARBOUR and ITS RISK ASSESSMENT Quratulan Ahmed1,*, Levent Bat2
9(3): 012-016 (2015) Journal of FisheriesSciences.com E-ISSN 1307-234X © 2015 www.fisheriessciences.com ORIGINAL ARTICLE Research Article MERCURY (Hg) LEVELS IN INDIAN MACKEREL Rastrelliger kanagurta (SCOMBRIDAE) FROM KARACHI FISH HARBOUR AND ITS RISK ASSESSMENT Quratulan Ahmed1,*, Levent Bat2 1The Marine Reference Collection and Resources Centre, University of Karachi, Karachi, 75270 Pakistan 2University of Sinop, Fisheries Faculty, Department of Hydrobiology, TR57000 Sinop, Turkey Received: 03.04.2015 / Accepted: 24.04.2015 / Published online: 28.04.2015 Abstract: The present study was conducted to determine Hg levels in edible tissues of the Indian mackerel Rastrelliger kanagurta collected at Karachi Harbour of Pakistan between March 2013 and February 2014. Hg levels ranged from 0.01 to 0.09 with mean ± SD 0.042 ± 0.023 mg/kg dry wt. The Hg level in R. kanagurta is relatively low when compared to those studied in other parts of the world and is able to meet the legal standards by EU Commission Regulation and other international food standards. The findings obtained were also compared with established allowable weekly intake values. It is concluded that the Hg levels in the Indian mackerel from Karachi coasts did not exceed the permission limits (0.5 mg/kg). The results show that the Indian mackerel appears to be useful bio-indicator due to their accumulation of Hg, however, continued sampling is required for further researches. Keywords: Mercury, Rastrelliger kanagurta, Bio-indicator, Karachi fish harbour, Pakistan *Correspondence to: Quratulan Ahmed, The Marine Reference Collection and Resources Centre, University of Karachi, Karachi, 75270 Pakistan E-mail: [email protected] Tel: +92 (345) 2983586 12 Journal of FisheriesSciences.com Ahmed Q and Bat L 9(3): 012-016 (2015) Journal abbreviation: J FisheriesSciences.com Introduction exposure route possibly allowing metal biomagnification up trophic levels in the Indian mackerel R.
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