Gut content analysis of snake mackerel Gempylus serpens (Cuvier, 1892) in Iligan Bay, northern Mindanao, Philippines
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Gut content analysis of the snake mackerel, Gempylus serpens (Cuvier, 1829), a commercially important fish in Iligan Bay, Philippines, is critical for understanding its ecological role in marine ecosystems. From July 2022 to March 2023, 58 individuals (total length 64.3 to 100.7 cm) were collected from Barangay Tambacan, Iligan City, a coastal city along Iligan Bay in Northern Mindanao, Philippines. Fish were the dominant prey, indicated by mean weight, frequency of occurrence, and index of relative importance. Cannibalism was documented, as two specimens contained remains of G. serpens. The species is a generalist predator, and significant positive correlations were found between gut length and total length, and between body weight and stomach weight with contents. Prey items were mostly in advanced stages of digestion, suggesting rapid digestion. This study highlights the ecological significance of G. serpens in Iligan Bay. Understanding the feeding ecology of G. serpens enriches our knowledge of marine food webs and supports the development of sustainable fishing practices, ensuring the long-term health of marine ecosystems.
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