Improved survival, prey selectivity and diel feeding cycle of silver therapon Leiopotherapon plumbeus (Perciformes: Terapontidae) larvae reared in tanks with substrate
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Physical substrates in the rearing environment can influence the early survival and feeding patterns of captive-reared fish. In this study, we determined whether substrates affect the survival and growth of hatchery-reared silver therapon Leiopotherapon plumbeus larvae as well as examined their prey selectivity and diel feeding cycle. Newly hatched larvae [1.92 mm total length (TL)] were reared for 40 days in triplicate 4 m3 tanks with or without tropical almond Terminalia catappa leaves as substrate. Prey selectivity of larvae reared in tanks with substrate for 35 days from the yolk-sac stage was measured by the Chesson’s selectivity index (αi). Diel feeding cycle of 3-4 days post-hatch (dph) silver therapon larvae reared in tanks exposed to natural light cycle and fed wild zooplankton was also studied. Larvae reared in tanks with substrate had significantly higher survivorship (48.44 ± 7.85%) than those reared in tanks without substrate (26.73 ± 1.60%). However, total length, specific growth rate and body weight of silver therapon larvae from tanks with or without substrate were not significantly different. Silver therapon larvae are generalist predator, demonstrating a degree of prey selectivity in some prey items during early ontogeny. Prey selectivity of silver therapon larvae varied during larval ontogeny, with higher Chesson’s selectivity index for copepod nauplii among the smaller fish larvae (2–5 dph; 2.94–5.17 mm TL), cladocerans (Moina micrura and Bosmina coregoni) among intermediate (6–11 dph; 5.72–9.60 mm TL), and ostracod, cladoceran and insect larvae among larger fish (12–35 dph; 10.28–20.96 mm TL). Larvae showed a diel feeding cycle where they actively fed during daylight hours, with a peak in the late afternoon, and reached a minimum at dark. Together, these findings advance our understanding of the feeding predatory behavior and efficiency of silver therapon larvae and preference for tanks with substrate that improve their survival.
KeywordsDiel feeding Leiopotherapon plumbeus Prey selectivity Substrate
This study was funded by the SEAFDEC Aquaculture Department (Project Nos. Nr-01-F2013B and Br-02-F2015B). The authors are grateful to NB Olorvida for his assistance in the conduct of the experiment. Handling of fish specimens complied with existing regulations of the Philippines.
- Chyau CC, Ko PT, Mau JL (2006) Antioxidant properties of aqueous extracts from Terminalia catappa leaves. Food Sci Technol 39:1099–1108Google Scholar
- Gehrke P (1994) Influence of light intensity and wavelength on phototactic behaviour of larval silver perch Bidyanus bidyanus and golden perch Macquana ambigua and the effectiveness of light traps. J Fish Biol 44:741–751Google Scholar
- Hacunda JS (1981) Trophic relationships among demersal fishes in a coastal area of the Gulf of Maine. Fish Bull 79:775–788Google Scholar
- Houlihan D, Boujard T, Jobling M (eds.) (2008) Food intake in fish. John Wiley & Sons.Google Scholar
- Hunter JR (1981) Feeding, ecology and predation of marine fish larvae. In: Lasker R (ed) Marine fish larvae: morphology ecology and relation to fisheries. University of Washington Press, Seattle, pp 33–77Google Scholar
- Ikhwanuddin Mhd, Moh JHZ, Hidayah M, Noor-Hidayati AB, Aina-Lyana NMA, Nor Juneta AS (2014) Effect of indian almond, Terminalia catappa leaves water extract on the survival rate and growth performance of black tiger shrimp, Penaeus monodon post larvae. AACL Bioflux 7:85–93Google Scholar
- Jamet JL, Lair N (1991) An example of diel feeding cycle of two percids, perch (Perca fluviatilis) and ruffe (Gymnocephalus cernuus) in eutrophic Lake Aydat (France). Annales des Sciences Naturelles Zoologie et Biologie Animale 12:99–105Google Scholar
- Mane AM (1934) Spawning and feeding habits of Mesopristes plumbea (Kner), a common theraponid in Laguna de Bay. Phil Agric 6:502–515Google Scholar
- Mercene EC, Cabrera LP (1991) Contribution to the biology of ‘ayungin’, Therapon plumbeus (Kner). Philipp J Fish 22:79–85Google Scholar
- Shirota A (1977) Studies on the mouth size of fish larvae. Method and conclusions only [Translation from: Bull Jpn Soc Sci Fish 36:353–368, 1970]. Windermere, UK, Freshwater Biological Association, (FBA Translations (New Series), 99))Google Scholar