Biological characteristics and determination of population dynamics parameters of Nemipterus japonicus in the coastal waters of Province Bushehr, Persian Gulf
This study was conducted to determine biological characteristics and population dynamicsparameters of threadfin bream (Nemipterus japonicus) in Persian Gulf (Bushehr Province),during November 2006 and October 2007. The minimum and maximum specimens were 75-273 mm FL and their weight was 7.6 - 351.9 g. Based on the exponential relationship betweenfork length and weight, slope (b) for individuals, males and females was 2.987321, 2.992546and 3.007314, respectively.The emptiness value (V) was 45.6% and it shows that N. japonicus is a moderate feeder.The results of Fp indicates that crustacean with 78.2% are main foods, mollusca (27.7%),fishes (20.7%), polychaeta (19.2%) and Foraminifera (11.7%) were identified as minor foodsand phytoplanktons (9.9%), nematoda(8.0%), echinodermata (2.3%) and sea weeds (0.3%)were random foods.The reproduction studies showed the spawning season extended within 2 peaks, fromApril- May and September and main spawning occurs in spring season.The mean absoluteand relative fecundities were 472388±42633 and 3817±293 (X±SE), respectively. Themaximum, minimum and mean of oocyte diameter were 0.448, 0.022 and 0.221mm (SE=0.071), respectively.The fork length at 50% maturity estimated to be 20.25 cm for females.The growth coefficient (K) , length infinity (L∞ ) and ɸ' was estimated 0.42/yr , 34.17 cmand 2.69, respectively.The coefficient of total mortality, fishing mortality, natural mortality and E was 1.37,0.43, 0.94 and 0.31, respectively.
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| Format: | thesis biblioteca |
| Language: | Persian |
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Islamic Azad University, Science and Research Branch, Tehran, Marine Biology
2009
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| Subjects: | Biology, Ecology, Fisheries, |
| Online Access: | http://hdl.handle.net/1834/34400 |
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