A sexually mature albino specimen of the Gillbacker Sea Catfish species Sciades parkeri (Siluriformes, Ariidae), a vulnerable species, was captured in northern Amazon estuary, State of Pará, Brazil. Herein we present the first record of albinism phenomenon for this species, including the morphometric description of the albino, and a non-abnormal coloring specimen.
Key words:
Amazon; delta; estuary; Marajó; vulnerable
| GEA 2239 | GEA 2240 | |
|---|---|---|
| Albino | Melanic | |
| Total length (mm) | 685 | 770 |
| Standard length (mm) | 567 | 612 |
| Head length (mm) | 155 | 188 |
| Percents of Total length | ||
| Maxillary barbel | 25.0 | 21.7 |
| Mandibular barbel | 12.7 | 13.1 |
| Mental barbel | 9.3 | 8.8 |
| Percents of Standand length | ||
| Head length | 27.3 | 30.7 |
| Dorsal-fin base | 10.1 | 9.3 |
| Percents of Head length | ||
| Snout length | 4 | 6 |
| Mouth width | 8.8 | 10.4 |
| Maxillary barbel | 17.1 | 16.7 |
| Mandibular barbel | 8.7 | 10.1 |
| Mental barbel | 6.4 | 6.8 |
| Anterior internarial distance | 5.1 | 6.4 |
| Interorbital distance | 6.5 | 8.4 |
| Eye diameter | 1.1 | 1.3 |
| Width of supraoccipital process at base | 4.3 | 5.1 |
| Length of supraoccipital process | 2 | 1.3 |
| Width of nuchal plate | 4.7 | 5.6 |
| Length of nuchal plate | 4.3 | 5 |
