Importance of marinas and off-channel water bodies as refuges for young fishes in a regulated lowland river
✍ Scribed by Copp, G. H.
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 195 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0886-9375
No coin nor oath required. For personal study only.
✦ Synopsis
Using graphical and statistical methods, I demonstrate that signi®cantly higher numbers of 0 ®sh were observed in offchannel water bodies than in the regulated, channelized River Great Ouse (ANOVA, d.f. 2399, F 3Á01, p 0Á03); this study emphasizes the importance of marinas and other off-channel areas as refuges and nurseries for small and young ®shes. Also, a near signi®cant decrease (Mann±Whitney U-test, p 0Á0533) was observed in the frequency of samples containing ®sh in the main river following macrophyte cutting operations in the main channel, with a signi®cant rise in an adjacent commercial marina (Mann±Whitney U-test p 0Á03). Although not conclusive, the results corroborate previous results that macrophyte cutting operations can be detrimental to the recruitment of 0 ®sh, which rely upon the submerged macrophytes for both feeding and refuge.