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Age and growth of the sand shark, Rhinobatos annulatus , in Algoa Bay, South Africa
Author(s) -
Rossouw G. J.
Publication year - 1984
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.1095-8649.1984.tb04868.x
Subject(s) - biology , bay , fishery , anatomy , zoology , oceanography , geology
Annual rings on the vertebral centra were used to determine age in the sand shark, Rhinobatos annulatus . A 6% silver nitrate solution was applied to the concave surfaces of the vertebrae to clarify the rings. The monthly percentage frequency of opaque and hyaline peripheral rings were used to determine the annual nature of the rings. Both sexes can reach a maximum age of 7 years. Conventional growth curves could not be fitted and empirical curves were used to illustrate growth. Total body length at age was calculated from these curves and compared with observed data.