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Retinal development and retinomotor responses in perch, Perca fluviatilis L.
Author(s) -
Guma'a S. A.
Publication year - 1982
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1982.tb03960.x
Subject(s) - perch , biology , retina , retinal , metamorphosis , anatomy , zoology , fish <actinopterygii> , fishery , neuroscience , ecology , botany , larva
The development of the retina of perch, Perca fluviatilis L., was studied for all developmental stages. The density of cones 100 μm‐ 1 was found to decrease with age, although their actual numbers increased. All premetamorphosed perch had pure‐cone retinae, the rods developing at, or after metamorphosis. Retinomotor responses were found to commence after metamorphosis when the rods developed. Visual acuity, measured as the minimum separable angle (α), was observed to improve exponentially with age, and its value was found to depend more on the focal length of the lens, than on the number of cones in the retina. The cones in the unspecialized part of the retina were predominantly of the twin type and were related to single cones in a ratio of 4 : 1.