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

Jennifer M Cobcroft; P M Pankhurst; P R Hart; S C Battaglene

doi:10.1111/j.1095-8649.2001.tb00185.x

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

Journal article

Peer reviewed

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

Jennifer M Cobcroft, P M Pankhurst, P R Hart and S C Battaglene

Journal of Fish Biology, Vol.59(5), pp.1181-1197

2001

DOI: https://doi.org/10.1111/j.1095-8649.2001.tb00185.x

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Abstract

Ecology

Zoology

Fisheries Sciences

turbidity

light intensity

experience

greenwater

feeding

striped trumpeter

marine fish larvae

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.

Details

Title: The effects of light intensity and algae-induced turbidity on feeding behaviour of larval striped trumpeter
Authors: Jennifer M Cobcroft (Author) - University of Tasmania
P M Pankhurst (Author) - University of Tasmania
P R Hart (Author) - University of Tasmania
S C Battaglene (Author) - University of Tasmania
Publication details: Journal of Fish Biology, Vol.59(5), pp.1181-1197
Publisher: Wiley-Blackwell Publishing Ltd.
Date published: 2001
DOI: 10.1111/j.1095-8649.2001.tb00185.x
ISSN: 0022-1112
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99450141902621
Output Type: Journal article

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Web Of Science research areas: Fisheries; Marine & Freshwater Biology