Investigating photoreceptor densities, potential visual acuity, and cone mosaics of shallow water, temperate fish species

Hunt, D.E, Rawlinson, N.J.F., Thomas, G.A., and Cobcroft, J.M. (2015) Investigating photoreceptor densities, potential visual acuity, and cone mosaics of shallow water, temperate fish species. Vision Research, 111 (Part A). pp. 13-21.

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The eye is an important sense organ for teleost species but can vary greatly depending on the adaption to the habitat, environment during ontogeny and developmental stage of the fish. The eye and retinal morphology of eight commonly caught trawl bycatch species were described: Lepidotrigla mulhalli; Lophonectes gallus; Platycephalus bassensis; Sillago flindersi; Neoplatycephalus richardsoni; Thamnaconus degeni; Parequula melbournensis; and Trachurus declivis. The cone densities ranged from 38 cones per 0.01 mm(2) for S. flindersi to 235 cones per 0.01 mm(2) for P. melboumensis. The rod densities ranged from 22800 cells per 0.01 mm(2) for L. mulhalli to 76634 cells per 0.01 mm(2) for T. declivis and potential visual acuity (based on anatomical measures) ranged from 0.08 in L. gallus to 0.31 in P. melbournensis. Higher rod densities were correlated with maximum habitat depths. Six species had the regular pattern of four double cones arranged around a single cone in the photoreceptor mosaic, while T. declivis had only rows of double cones. P. melbournensis had the greatest potential ability for detecting fine detail based on eye anatomy. The potential visual acuity estimates and rod densities can be applied to suggest the relative detection ability of different species in a commercial fishing context, since vision is a critical sense in an illuminated environment for perceiving an oncoming trawl.

Item ID: 50039
Item Type: Article (Research - C1)
ISSN: 0042-6989
Keywords: potential visual acuity, rod density, cone density, cone mosaic, minimum separable angle
Funders: Australian Maritime College, University of Tasmania (UTAS), University of the Sunshine Coast (USC)
Projects and Grants: UTAS APA Stipend, USC CRN Research Fellowship
Date Deposited: 30 Aug 2017 15:31
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070405 Fish Physiology and Genetics @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830204 Wild Caught Fin Fish (excl. Tuna) @ 50%
97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 50%
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