The impact of light intensity and algal-induced turbidity on first-feeding Seriola lalandi larvae

Carton, Alexander G. (2005) The impact of light intensity and algal-induced turbidity on first-feeding Seriola lalandi larvae. Aquaculture Research, 36 (16). pp. 1588-1594.

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Abstract

Feeding performance (intensity and incidence) of first-feeding yellowtail king¢sh larvae was evaluated under a range of light intensities and algal-induced turbidities. Larvae were fed with varying degrees of success under all light intensities tested (0^17 mmol s1m2), in both clearwater and greenwater (8 x 104 cellsmL1). There was a consistent trend for feeding performance to increase with larval age and light intensity in both clearwater and greenwater conditions, demonstrating that visual proficiency increases with larval age. Feeding intensity remained low over the first 3 days of first feeding across all light intensities tested. Days 6 and 7 post-hatch larvae showed considerably higher feeding intensities particularly at 8 and17 mmol s 1m2. This improvement indicates an ontogenetic shift in sensory or locomotor competence. First-feeding larvae performed equally well in both clearwater and greenwater (8 x 104 cellsmL1) conditions, although at the lowest light intensity tested (0.1 mmol s1m2) feeding performance was noticeably reduced. Feeding performance was severely diminished across all larval ages at an algal cell density of 32 104 cellsmL1, demonstrating that for this species algal-induced turbidities 416 104 cellsmL1 adversely affect the ability to capture free-swimming prey during the first-feeding window.

Item ID: 9511
Item Type: Article (Refereed Research - C1)
Keywords: light intensity; greenwater culture; first feeding; feeding performance
ISSN: 1365-2109
Date Deposited: 24 Mar 2010 03:58
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070401 Aquaculture @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8301 Fisheries - Aquaculture > 830102 Aquaculture Fin Fish (excl. Tuna) @ 100%
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