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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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.
การอ้างอิงAya, F. A., Corpuz, M. N. C., & Garcia, L. M. B. (2015). Diet composition, feed preferences and mouth morphology of early stage silver therapon (Leiopotherapon plumbeus, Kner 1864) larvae reared in outdoor tanks.
Plankton surveys; Animal morphology; Insect larvae; Length; Food preferences; Biometrics; Nutrition; Fish larvae; Protists; Diets; Feeding; Zooplankton; Ciliates; Dominance; Hatcheries; Digestive system; Body size; Mouth; Hatching; Predation; Leiopotherapon plumbeus; Copepoda; Leiopotherapon; Therapon; Cladocera
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Meristic and morphometric variation in the silver perch, Leiopotherapon plumbeus (Kner, 1864), from three lakes in the Philippines Quilang, J. P.; Basiao, Zubaida U.; Pagulayan, R. C.; Roderos, R. R.; Barrios, E. B. (Blackwell Publishing, 2007)A number of researchers have applied multivariate methods to elucidate the population structure of fishes. In this study, we also used multivariate techniques to examine meristic and morphological variations in the silver ...
Embryonic and larval development of hatchery-reared silver therapon Leiopotherapon plumbeus (Perciformes: Terapontidae) Aya, Frolan A.; Nillasca, Vicar Stella N.; Garcia, Luis Maria B.; Takagi, Yasuaki (Springer Verlag, 2016)The embryonic and larval development of hatchery-reared silver therapon Leiopotherapon plumbeus are described to provide essential information on the early life history of this species. Egg size, larval size at hatching, ...
Larval and early juvenile development of silver therapon, Leiopotherapon plumbeus (Actinopterygii: Perciformes: Terapontidae), reared in mesocosms Aya, Frolan A.; Corpuz, Mark Nell C.; Laron, Manuel A.; Garcia, Luis Maria B. (Szczecińskie Towarzystwo Naukowe, 2017)The silver therapon, Leiopotherapon plumbeus (Kner, 1864), is an endemic and economically important freshwater food fish in the Philippines. The natural populations of this species have been declining during the past years, ...