The effects of light intensity and algae-induced turbidity on feeding behaviour of larval striped trumpeter

Cobcroft, J.M., Pankhurst, P.M., Hart, P.R., and Battalene, S.C. (2001) The effects of light intensity and algae-induced turbidity on feeding behaviour of larval striped trumpeter. Journal of Fish Biology, 59 (5). pp. 1181-1197.

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Abstract

Striped trumpeter larvae reared in algal cell-induced turbid water (greenwater) fed equally well in clearwater in a light intensity range of 1–10 μmol s-1 m-2, when evaluated in terms of both the proportion of larvae feeding and larval feeding intensity. An ontogenetic improvement in photopic visual sensitivity of larvae was indicated by improved feeding at 0·1 μmol s-1 m-2, from 26±5% of larvae feeding and 0·027±0·005 rotifers consumed per feeding larva min-1 on day 8, to 96±2% and 0·221±0·007 rotifers consumed larva-1 min-1 on day 23 post-hatching. Algal cell-induced turbidity was shown to reduce incident irradiance with depth, indicated by increasing coefficients of attenuation (1·4–33·1) with increasing cell densities (0–2×106 cells ml-1), though light intensities in the feeding experiment test chambers, at the algal cell densities tested, were within the optimal range for feeding (1–10 μmol s-1 m-2). Algae-induced turbidity had different effects on larval feeding response dependent upon the previous visual environment of the larvae. Young larvae (day 9 post-hatching) reared in clearwater showed decreased feeding capabilities with increasing turbidity, from 98±1% feeding and 0·153±0·022 rotifers consumed larva-1 min-1 in clearwater to 61±10% feeding and 0·042±0·004 rotifers consumed larva-1 min-1 at 56 NTU, while older clearwater reared larvae fed well at all turbidities tested. Likewise, greenwater reared larvae had increased feeding capabilities in the highest algal cell densities tested (32 and 66 NTU) compared with those in low algal cell density (6 NTU), and clearwater (0·7 NTU) to which they were naïve.

Item ID: 50055
Item Type: Article (Research - C1)
ISSN: 1095-8649
Keywords: turbidity, light intensity, experience, greenwater, feeding, striped trumpeter, marine fish larvae
Funders: Cooperative Research Centre for Aquaculture, University of Tasmania (UT)
Projects and Grants: UT Cuthbertson Scholarship
Date Deposited: 30 Aug 2017 15:31
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070401 Aquaculture @ 80%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070405 Fish Physiology and Genetics @ 20%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8301 Fisheries - Aquaculture > 830102 Aquaculture Fin Fish (excl. Tuna) @ 100%
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