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Publikations-Art
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Kongressbeitrag
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Autoren
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C. Lückstädt, U. Focken, K. Becker
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Erscheinungsjahr
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2001
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Veröffentlicht in
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Book of Abstract
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Herausgeber
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Asian Fisheries Society
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Seite (von - bis)
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80
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Tagungsname
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6th Asian Fisheries Forum
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Tagungsort
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Kaohsiung, Taiwan
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Tagungsdatum
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25.-30.11.2001
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Schlagworte
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feeding behaviour, milkfish, natural food
Abstract
Milkfish (Chanos chanos Forsskål) is the most important cultured finfish species in the Philippines. One of the management methods used in milkfish pond culture is the modified Taiwanese method, where fish are regularly restocked (every 6 to 8 weeks) in order to have different size classes in the pond simultaneously. It has often been claimed, that the food items ingested by milkfish differ according to the size of the fish. Therefore using the modified Taiwanese method might reduce diet competition between fish and enable the resource "natural food" to be used optimally. The present study aimed to find out, if this also holds true for premarketable- and marketable juvenile milkfish from semi-intensive brackishwater ponds.
A commercially managed pond (9 ha) was monitored in Banate, Iloilo, Philippines in July 1998 (wet season). Growth of natural food was enhanced by fertilization. No supplemental feed was given to the fish. During the monitoring, 71 milkfish were caught using a cast-net every other hour (3 fish each) over a period of 48 hours, thus covering all hours of the day. Of the caught fish, 47 had a full stomach. The milkfish were distributed within three weight-classes (< 100 g, 100-200 g, > 200 g) covering the premarketable- and marketable size of milkfish in the Philippines. Fish, stomachs and guts were measured and weighed to the nearest mm and 0.1 g respectively. Stomachs were removed and preserved in 70 % alcohol. The stomach contents were later analysed microscopically according to the percentage of the microscope slide covered by each of the main diet components.
