Seasonal Variations in Length-Weight Relationship and Condition Factor of Atlantic Mackerel (Scomber scombrus) in the Coastal Waters of Tripoli, Libya
DOI:
https://doi.org/10.63359/j969hw07Keywords:
Scomber scombrus, Length-weight relationship, Fulton’s condition factor, Allometric growth, Southern MediterraneanAbstract
This study provides a comprehensive assessment of the length-weight relationship (LWR) and physiological condition of the Atlantic mackerel (Scomber scombrus) in Tripoli waters, Libya, based on seasonal sampling from Autumn 2022 to Summer 2023. A total of 120 specimens were analyzed, ranging from 15.0 to 33.0 cm in total length and 52.0 to 337.0 g in total weight. The overall LWR was established as W=0.0671⋅L2.395 (R2=0.877), indicating a significant negative allometric growth pattern (b<3). Analysis by sex revealed that both females (W=0.1400⋅L2.159, R2=0.812) and males (W=0.0453⋅L2.510, R2=0.789) exhibited negative allometry, with males displaying a slightly higher weight gain relative to length. Seasonal analysis revealed highly dynamic growth strategies, shifting from strong negative allometry in Autumn 2022 (b=0.70) to positive allometry in Summer 2023 (b=3.49), with isometric growth observed during the Spring (b=2.77). Fulton’s condition factor (K) peaked in Winter 2023 (1.057±0.28), corresponding with the pre-spawning period, and reached its minimum in Summer 2023 (0.919±0.07). Statistical analysis showed no significant sexual dimorphism in condition (p=0.135), though females generally exhibited higher K values (1.018) than males (0.957). These results indicate that while the populations of this species in the coastal waters of Tripoli follow the general seasonal trends of the Mediterranean, they adopt unique, sex-specific growth strategies. This underscores the need for localized, ecosystem-based fisheries management to ensure the sustainable conservation of this commercially vital species
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