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Littoral and Benthic Investigations on the West Coast of Ireland: XVIII. The Biology of the Short-Spined Sea Scorpion Myoxocephalus scorpius scorpius (L.) in the Galway Bay Area

Pauline A. King, Julie M. Fives and J. Dunne
Proceedings of the Royal Irish Academy. Section B: Biological, Geological, and Chemical Science
Vol. 83B (1983), pp. 325-334
Published by: Royal Irish Academy
Stable URL: http://www.jstor.org/stable/20494426
Page Count: 11
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Littoral and Benthic Investigations on the West Coast of Ireland: XVIII. The Biology of the Short-Spined Sea Scorpion Myoxocephalus scorpius scorpius (L.) in the Galway Bay Area
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Abstract

The biology of the short-spined sea scorpion Myoxocephalus scorpius scorpius (L.) was investigated between March 1979 and March 1980 A total of ninety-six specimens was collected at approximately monthly intervals off the north shore of Galway Bay. The fish were captured on rough ground among seaweeds at depths of 10-20m. The female: male sex ratio was 0.88: 1 (P < 0.05). Otoliths were used for age determination. A von Bertalanffy growth function yielded the equation $\text{L}_{\text{t}}$ = 23.31 ($1-\text{e}^{-0.8459(\text{t}-0.2451)}$) for females and $\text{L}_{\text{t}}$ = 20.44 ($1-\text{e}^{-0.5347(\text{t}-0.2428)}$) for males. Growth of both sexes is rapid during the first year of life but slows down as the fish gets older. The maximum age recorded was three years. Males seem to mature at a smaller size and earlier age than females. A short spawning season occurs in winter and early spring. The diet consists mainly of crustaceans and fish.

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