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A rare case of abnormal hyperpigmentation in a freshwater sardine, Triportheus auritus (Characiformes, Triportheidae) from the Amazon basin, Brazil
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A rare case of abnormal hyperpigmentation in a freshwater sardine, Triportheus auritus (Characiformes, Triportheidae) from the Amazon basin, Brazil
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A rare case of abnormal hyperpigmentation in a freshwater sardine, Triportheus auritus (Characiformes, Triportheidae) from the Amazon basin, Brazil
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Journal Article
A rare case of abnormal hyperpigmentation in a freshwater sardine, Triportheus auritus (Characiformes, Triportheidae) from the Amazon basin, Brazil
2024
Overview
Morphometrics of the hypermelanic Triportheus auritus specimen Character Measure (mm) %SL Total length 225.0 Standard length 187.0 Head length 42.1 22.51 Snout to anal-fin origin 141.0 75.40 Snout to dorsal-fin origin 123.0 65.77 Snout to pelvic-fin origin 89.8 48.02 Anal-fin base length 33.8 18.07 Caudal-peduncle length 12.1 6.47 Caudal-peduncle height 16.1 8.61 Dorsal-fin base length 18.4 9.83 Dorsal-fin height 15.6 8.34 Pectoral-fin length 61.5 32.88 Pelvic-fin length 26.6 14.22 SL standard length The hypermelanic T. auritus specimen is an adult of 194.0 mm SL, apparently healthy and with no evidences of injuries or presence of parasites. The histological analysis of a hypermelanic scale (Fig. 1c) showed differences in color pattern when compared to a sample from normal-colored T. auritus. Despite the plausible relation between the occurrence of hypermelanistic fish and black waters, the rarity of the case reported herein (only one hypermelanic known specimen for an abundant and widespread species) suggests that the observed case of hypermelanosis represents an individual abnormality in the T. auritus population. A particular case has been documented to a single specimen of the marine ray Raja montagui (Rajidae), which presented hypermelanosis in parts of the cartilaginous skeleton, probably resulting from some metabolic disturbance (Harper 1932).
