Behavioural and electrophysiological responses to F-prostaglandins, putative spawning pheromones, in three salmonid fishes
✍ Scribed by F. Laberge; T. J. Hara
- Book ID
- 104455546
- Publisher
- John Wiley and Sons
- Year
- 2003
- Tongue
- English
- Weight
- 215 KB
- Volume
- 62
- Category
- Article
- ISSN
- 0022-1112
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✦ Synopsis
Behavioural and electro‐olfactogram (EOG) responses to synthetic F‐prostaglandins (PGFs) were recorded in the three salmonids: brown trout Salmo trutta, lake whitefish Coregonus clupeaformis and rainbow trout Oncorhynchus mykiss. Exposure to 10^−8^ M PGF~2α~ and 13, 14‐dihydro‐PGF~2α~ increased swimming activity in individually exposed brown trout in a flow‐through tank. Digging and nest probing behaviours were further observed in brown trout females exposed to PGF~2α~. Lake whitefish exposed to 10^−8^ M PGF~2α~ and 15‐keto‐PGF~2α~ also increased their locomotion. In rainbow trout, the absence of behavioural responses to PGFs correlates with a lack of olfactory sensitivity to these chemicals. PGFs triggered behavioural responses distinct from the feeding stimulant in brown trout. EOG measurements demonstrated that brown trout were most sensitive to PGF~2α~, with a threshold concentration of 10^−11^ M. Lake whitefish were most sensitive to both 15‐keto‐PGF~2α~ and 13, 14‐dihydro‐PGF~2α~. Cross‐adaptation and binary mixture experiments suggest that only one olfactory receptive mechanism is involved in PGFs detection. The behavioural and olfactory responses observed with exposure to PGF~2α~ and its metabolites suggest these compounds function as reproductive pheromones in brown trout and lake whitefish.