Estimate growth and mortality parameters of Nematalosa nasus (Bloch, 1795 ) in coastal waters of the Persian Gulf (Hormozgan Province)

Document Type : (original research)

Authors

1 Department of Fisheries, Faculty of Marine Science and Technology, Hormozgan University, Bandar Abbas, Iran

2 Department of Natural and Environmental Sciences, Mangrove Forest Research Center, Hormozgan University, Bandar Abbas, Iran

10.22034/AEJ.2021.292364.2570

Abstract

Some population parameters of N.nasus were studied by using Bottom-trawler for a period of 18 months from Nov 2016 to Apr 2018 in the coastal waters of the Persian Gulf (Hormozgan province). A total of 618 fish were selected as bycatch from shrimp bottom trawl and measured biometric data. The correlation between total length and weight for males and females showed a high value (R2 were estimated at 0.71 and 0.72 for males and females, respectively.  The b-value for length-weight relationship was 2.58 and 2.69 for males and females, respectively, indicating a positive allometric growth pattern in this species (P<0.05).  The FL∞ was estimated at 172 mm for males and 176 mm for females. In addition to the growth coefficient (K) for males and females was estimated at 1.3 and 1.1 Y-1, respectively. Also, t0 for males and females were -0.07 and -0.08Y-1, respectively. The Φ` coefficient index in males and females were 4.59and4.53, respectively. The recorded results of this study showed that the natural mortality rate (M) in males was 1.28 Y-1and for females were 1.14 Y-1and the fishing mortality rate (F) was 3.25 in males and 2.23 Y-1 in females, respectively. The total mortality (Z) for males and females was estimated at 4.53 and 3.37 Y-1, respectively. Also, the exploitation coefficient (E) for this species was 0.66 and 0.72 in males and females, respectively.                                                                                                                                                        

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References

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Journal of Animal Environment
Volume 14, Issue 2
July 2022
Pages 199-204

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