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Diet composition, feed preferences and mouth morphology of early stage silver therapon (Leiopotherapon plumbeus, Kner 1864) larvae reared in outdoor tanks

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Date
2015
Author
Aya, Frolan
Corpuz, M. N. C.
Garcia, LM
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Abstract
This study examined the diet composition, feeding preferences, and mouth morphology of the silver therapon (Leiopotherapon plumbeus, Kner 1864) larvae under captive conditions. Larvae were reared in outdoor tanks (4 m3) with natural food grown 2 weeks prior to start of larval rearing. Food preference was measured by the Chesson's electivity index (αi). Gut content analysis of larvae sampled between 5 and 25 days after hatching (DAH) showed the dominance in the diet by zooplankton, mainly copepod nauplii, cladocerans and insect larvae. Small fish larvae (5–9 DAH; 3.32–6.29 mm standard length) preferred cladocerans, ciliates and copepod nauplii; whereas older larvae (12–25 DAH; 5.45–19.26 mm standard length) preferred insect larvae over cladocerans and adult insects. The mouth gape size at 5 DAH was 359 μm and increased to 3.75 mm at 40 DAH when body size grew at an average rate of 0.59 mm d−1. The standard length (SL) of L. plumbeus larvae was strongly associated with mouth size (r2 = 0.98, P < 0.05), indicating a progressive increase of ingested prey size of the fish larvae. These results clarified the early life feeding ecology of this species, which is essential in developing effective hatchery techniques.
URI
http://hdl.handle.net/10862/2263
Suggested Citation
Aya, F., Corpuz, M. N. C., & Garcia, L. (2015). Diet composition, feed preferences and mouth morphology of early stage silver therapon (Leiopotherapon plumbeus, Kner 1864) larvae reared in outdoor tanks. Journal of Applied Ichthyology, 31(1), 77-82.
DOI
10.1111/jai.12486
Subject
Plankton surveys; Animal morphology; Insect larvae; Length; Food preferences; Biometrics; Nutrition; Fish larvae; Protists; Diets; feeding ASFA; Zooplankton; Ciliates; Dominance; Hatcheries; Digestive system; Body size; Mouth; hatching ASFA; Predation; Leiopotherapon plumbeus; Copepoda; Leiopotherapon; Therapon; Cladocera
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  • AQD Journal Articles [1155]

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    Embryonic and larval development of hatchery-reared silver therapon Leiopotherapon plumbeus (Perciformes: Terapontidae) 

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