Journal of Applied and Natural Science 6 (2): 589-593 (2014)
A record of anopthalmia in Mystus tengara (Hamilton, 1822) from Assam.
Jyotish Barman*, A. K. Jaiswar, S. K. Chakraborty, Shrinivas Jahgeerdar and W. S. Lakra
Central Institute of Fisheries Education (Deemed University), Indian Council of Agricultural Research, Panchmarg,
Off Yari road, Versova, Mumbai – 400061, INDIA
*Corresponding author. E-mail: firstname.lastname@example.org
Abstract : An abnormal case of anopthalmia in a striped catfish Mystus tengara (66.8 mm in standard length) from
Assam is reported in this communication. Thirty eight morphological characters of the abnormal specimen were also
studied and compared with normal specimens to observe variation in the morpho-meristic traits, if any. In the abnormal
specimen, the proportionate height of the dorsal fin (31.1 mm) and nasal barbel length (75.9 mm) was found to be
higher compared to that of the normal specimens (21.6 – 26.5 mm and 47.9 – 72.5 mm, respectively). While the
body depth of anus was higher in case of normal specimens (19.1 – 29.2 mm) compared to abnormal specimen
(14.5 mm). However, no marked variation was observed in meristic characters. This anomaly does not seem to have
affected morphological aspects. Factors like weed infestation, pesticide and herbicide application adversely affecting
the habitat is believed to be the cause of such deformity. The abnormality does not seem to have affected the overall
growth of the fish..
Keywords : Anopthalmia, Environmental stress, Morphological anomalies, Mystus tengara.