Importance of outer reef slopes for commercially important fishes: implications for designing a marine protected area in the Philippines |
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Authors: | Kentaro Honda Wilfredo H Uy Darwin I Baslot Allyn Duvin S Pantallano Masaaki Sato Yohei Nakamura Masahiro Nakaoka |
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Institution: | 1.Akkeshi Marine Station, Field Science Center for Northern Biosphere,Hokkaido University,Akkeshi,Japan;2.Hokkaido National Fisheries Research Institute, Japan Fisheries Research and Education Agency,Sapporo,Japan;3.Institute of Fisheries Research and Development,Mindanao State University at Naawan,Naawan,Philippines;4.Graduate School of Kuroshio Science,Kochi University,Nankoku,Japan;5.National Research Institute of Fisheries and Environment of Inland Sea,Japan Fisheries Research and Education Agency,Hatsukaichi,Japan |
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Abstract: | A passive acoustic telemetry survey was conducted to determine occurrence patterns of commercially important fishes on a steep reef slope along a marine protected area (MPA) in the southern Philippines, where the outer reef edge is often set as an offshore MPA boundary. Based on 4–61 days of tracking data from 21 detected individuals of five species (Lutjanus argentimaculatus, Lutjanus monostigma, Lethrinus atkinsoni, Lethrinus obsoletus, and Siganus guttatus; 20.7–69.2 cm fork length) caught near the reef slope of the MPA, S. guttatus occurred most frequently on the reef flat of the MPA, whereas all individuals of the four lutjanid and lethrinid species were primarily (99.4–100%) detected near the reef slope, and nine individuals (56.3% of these four species) of three of these species (not L. obsoletus) most likely used the shallow (≤10 m) and deep (≥20 m) layers, and thus, middle layers of the slope. These findings indicate that commercially important lutjanid and lethrinid species predominantly and vertically used the areas near the reef slope, suggesting the importance of fully including reef slopes in MPAs to enhance their effectiveness for the conservation of such fishes. |
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