Publication Date:
2021-01-19
Description:
Samples of Loligo forbesi were obtained from commercial sources and research cruises in Scottish waters for the period May 1984 to October 1986. The sea areas sampled fell into ICES fishery statistical sub-dividons VIb Rockall, VIa west coast, IVa nothern North Sea and IVb central North Sea. Within this area there were sexual and spatial variations in size, length-weight and body component/DML relationships. Males have larger overall mean size (DML and weight) and for both sexes the mean size of L. forbesi from the north eastern Atlantic is larger than those from the North Sea. The length-weight relationship in females was significantly different from that of males, and in both sexes the length-weight relationship was significantly different between samples from the north eastern Atlantic and those from North Sea waters. Multivariate analyses of fifteen morphometrical characters have identified variation in the morphometrics of L. forbesi within this range of distribution in Scottish waters. Growth rates were estimated for males and females separately from monthly increments in modes of length frequency histograms. Fishery recruitment occured mainly during April/May of each year at ~130mm DML (males) and ~100mm DML (females) followed by maximum growth rates of 286mm DML/month and 17.5mm DML/month respectively. There was some evidence for a second, weaker recruitment in November which showed slower growth rates.
Type:
Book chapter
,
PeerReviewed
Format:
text
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