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Body dimensions of farmed eels (Anguilla anguilla L.) in relation to condition factor, grading, sex and feeding |
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| Authors: | B Knights |
| Institution: | School of Engineering and Science, Polytechnic of Central London, London W1M 8JS, UK |
| Abstract: | Various body dimensions were measured in relation to weight in warm-water cultured European eels (0·2–120 g) at 16 and 25°C in seawater and at 25°C in freshwater to provide reference standards for use in aquacultural engineering management and research. The different conditions had no significant effects on relationships between weight and body, head or tail length, or trunk, head or pectoral dimensions. There were also no significant differences between small and large eels and no obvious variations were found that could be used to distinguish the sexes. However, the eyes tend to enlarge and the mouth decrease in size relative to weight in larger eels. Possible relationships between morphology and feeding are discussed. The combined data yielded the relationship, log L(cm) = 1·0306 + 0·27 log W(g) for eels from elver stage up to about 120 g. A condition factor, CF = L/10 W0·2711, is derived and its usefulness in aquaculture and research discussed. Morphometric and growth differences between cultured and wild eels are discussed. Body girth dimensions are considered and recommendations made for mesh apertures and bar spacings for basket and grid size-graders. |
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