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Low activity and seasonal change in population size structure of grenadiers in the oligotrophic abyssal central North Pacific Ocean
Article first published online: 22 JUL 2003
DOI: 10.1046/j.1095-8649.2003.00142.x
Additional Information
How to Cite
Priede, I. G., Deary, A. R., Bailey, D. M. and Smith, K. L. (2003), Low activity and seasonal change in population size structure of grenadiers in the oligotrophic abyssal central North Pacific Ocean. Journal of Fish Biology, 63: 187–196. doi: 10.1046/j.1095-8649.2003.00142.x
Publication History
- Issue published online: 22 JUL 2003
- Article first published online: 22 JUL 2003
- (Received 12 August 2002, Accepted 12 May 2003)
- Abstract
- Article
- References
- Cited By
Keywords:
- behaviour;
- Coryphaenoides;
- deep water;
- physiology;
- swimming
Analysis of video recordings of swimming in abyssal grenadiers Coryphaenoides spp. revealed site differences in tail-beat frequencies. At the highly oligotrophic deep central North Pacific (CNP; 5800 m depth) station fishes had significantly lower tail-beat frequencies (0·73 ± 0·02 Hz, mean ± s.e.) than fishes of similar size at the shallower ‘Station F’ (Sta. F; 4400 m depth) beneath the more productive waters of the California Current Upwelling (1·06 ± 0·04 Hz). These behavioural differences may be evidence for the proposed physiological adaptations of Coryphaenoides armatus and Coryphaenoides yaquinae, to different depths and food supply levels. At CNP, smaller fishes (38·9 cm mean LT) were present in autumn than in summer (59·4 cm LT) suggesting large-scale migrations across the abyssal ocean floor despite the observed slow swimming speeds.