بومشناسی آبزیان (Jun 2023)
Feeding ecology of four-lined terapon (Pelates quadrilineatus) in Makkoran coastal waters
Abstract
In light of limited biological data, particularly concerning the dietary habits of four-lined terapon fish (Pelates quadrilineatus), a comprehensive study was conducted. A total of 140 fish samples were gathered from various points along the Makkoran coast, including the Chabahar fish market and catch unloading centers in Chabahar, Ramin, and Tis. The investigation aimed to delineate their seasonal feeding patterns from the onset of summer 2019 until the conclusion of spring 2020. The findings revealed the average total length and weight of the fish to be 18.51±4.13 cm and 82.30±16.71 grams, respectively. Moreover, the average relative length of the intestine and stomach fullness/emptiness stood at 0.52% and 49.29%, respectively, indicating the species' carnivorous nature and moderate feeding tendencies. Notably, gastro-somatic index, feeding intensity, and condition factor during autumn were significantly lower than in other seasons, with averages of 1.48±0.24, 95.34±25.11, and 0.72±0.068, respectively (p<0.05). Assessment of food preference and relative importance unveiled mollusks and crustaceans as primary dietary components, with copepods, polychaetes, and fish identified as secondary sources for this species. Among mollusks and crustaceans, the gastropod and hermit crab held the greatest significance, accounting for 41% and 42% of the P. quadrilineatus' diet, respectively. Overall, the feeding indicators suggest that this species thrives as a carnivorous fish, exhibiting moderate feeding habits and favorable living conditions in the coastal waters of Makkoran
