Population structure of two Octopus species, Amphioctopus aegina and A. membranaceus in the Gulf of Suez, Egypt. | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 45, Volume 27, Issue 6, November and December 2023, Page 775-789 PDF (718.64 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejabf.2023.330203 | ||||
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| Author | ||||
| Ayman S. Ahmed et al. | ||||
| Abstract | ||||
| Ageing of Amphioctopus. aegina and A. membranaceus revealed three different age groups, and the main bulk of the catch was represented in the second age group for the two species. Von Bertalanffy growth constants were determined as; L∞= 11.76 cm DML, K= 0.39 year-1, t0= 0.11 year-1 and Ø= 1.73 for A. aegina, and L∞= 11.47 cm DML, K= 0.45 year-1, t0= 0.33 year-1 and Ø= 1.77 for A. membranaceus. The total mortality (Z), natural mortality (M), fishing mortality (F) and exploitation rate (E) were calculated as 2.87, 1.17, 1.70 and 0.59 year-1, respectively for A. aegina, and 2.70, 1.29, 1.41 and 0.52 year-1, respectively for A. membranaceus. The length at recruitment (Lr) of A. aegina and A. membranaceus was 1.9 and 2.4 cm DML, that corresponding to age (tr) of 0.56 and 0.85 year, respectively. Length at first capture (Lc) was 6.28 and 4.05 cm DML for A. aegina and A. membranaceus, respectively, and the age at the first capture (tc) was 2.07 and 1.46 years, respectively. This study is very important for fisheries management in the Gulf of Suez, where, some recommendations to reduce the exploitation rates for the two Octopus species in the Gulf were proposed. | ||||
| Keywords | ||||
| Amphioctopus aegina; A. membranaceus; age; growth; mortality; exploitation rate | ||||
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