Growth of Chaetodon larvatus (Chaetodontidae: Pisces) in the southern Red Sea |
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Authors: | Z A Zekeria S Weertman B Samuel T Kale-ab J J Videler |
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Institution: | (1) Department of Marine Sciences, University of Asmara, P.O. Box 1220, Asmara, Eritrea;(2) Department of Marine Biology, Biological Center, University of Groningen, P.O. Box 14, 9750 Haren, AA, The Netherlands |
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Abstract: | Growth and age of Chaetodon larvatus were studied using growth bands in otoliths and length-frequency analyses. Otoliths of 180 C. larvatus were extracted and measured. Polished sections of sagittae revealed alternating opaque and translucent bands corresponding
with a seasonal growth pattern. Both mass and size of the otoliths continue to grow steadily throughout life. Length-at-age
data revealed very fast growth during the first year. Growth proceeded at a decreasing rate during the second and the third
year; fishes older than 3 years did not grow noticeably. No difference in growth patterns between males and females could
be detected. The growth parameters obtained for the whole population are: the asymptotic length (L
∞)=10.64 cm, growth constant (K)=1.14 year−1 and the theoretical age at length zero (t
0)=−0.30 year. The maximum age recorded was 14 years. Length frequency data collected at a recruitment site confirmed the fast
growth of juveniles. |
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