Length-weight relationship, length abundance, maturity percentage and growth parameters of green tiger prawn (Penaeus semisulcatus de Haan, 1844) caught by trawl net in the waters of Bushehr province (in Mond and Dayyer-Nakhilo)

Document Type : scientific research article

Authors

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

2 Corresponding Author, Dept. of Fisheries, Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas, Iran

3 Dept. of Fisheries, Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas, Iran

4 Fisheries Research Institute, Agricultural Research and Training Organization, Tehran, Iran

Abstract

Length-weight relationship, length abundance, maturity percentage and growth parameters of green tiger prawn caught using trawl nets in Mond and Dayyer-Nakhilo areas located in Bushehr province during the years 2020 (13 August to 15 February) and 2021 (11 April to 9 September). A total of 658 tiger shrimps, including 420 female shrimp and 238 male shrimp were bioassayed. Based on the carapace length of 43.43 mm in the first sexual maturity of the females, 50.71% (213 specimens) were mature and 49.29% (217 specimens) were immature. Also, the relationship between the total length and carapace length of female shrimps was y=0.3679 x - 2.1648 based on linear regression. The relationship between the length and weight of 420 female shrimps and 238 male shrimps caught showed that parameters a, b, and r2 were 0.0099, 3.057, and 0.92 for females and 0.0115, 2.9962, and 0.912 for males, respectively. Based on the Sturges formula, 10 length classes were observed for male and female shrimps caught. The length class of 108-12.3 cm for both males and females had the highest frequency with 110 specimens (46.22%) and 141 specimens (33.57%), respectively. The results of this study showed that the maximum length of male (16 cm) and female (20.5 cm) caught shrimps was less than the infinite length and more than the optimal length. Growth parameters (Clinf, K, t0) for females were -0.057, 2.1 and 72 (mm) and for males -0.075, 1.7 and 62 (mm), respectively. The values of Z, F and M parameters for females were 9.2, 7.4 and 2.16 and for males 7.58, 5.62 and 1.96. The exploitation rate (E) was 0.77 for females and 0.74 for males. These values indicate overexploitation and fishing pressure in the area. Therefore, it is necessary to implement fishing management approaches in these habitats.

Keywords

Main Subjects


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