Osmotic and ionic regulation in Scottish brown trout and sea trout (Salmo trutta
The brown trout (Sabno trutta L.) was originally a Palearctic fish, widely dis-tributed in Europe and western Asia from the Mediterranean to the Arctic. Many river drainage systems in this area contained, and still contain, two or even three more or less morphologically and behaviourally recognizabl...
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| Format: | Text |
| Language: | English |
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1959
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.631.7457 http://jeb.biologists.org/content/36/2/253.full.pdf |
| Summary: | The brown trout (Sabno trutta L.) was originally a Palearctic fish, widely dis-tributed in Europe and western Asia from the Mediterranean to the Arctic. Many river drainage systems in this area contained, and still contain, two or even three more or less morphologically and behaviourally recognizable forms of this species. These forms are the 'lake trout', living in fresh-water lakes, the 'brown trout', living in fresh-water streams, and the 'sea trout', an anadromous form. The question of whether or not these forms, especially the brown trout and the sea trout, are 'really ' (equals genetically) different from one another has been debated by fishermen and others for centuries. Trewavas (1953) reviewed the most significant portions of the voluminous literature on this subject. She concluded that average differences in some characters (meristic characters, age at maturity and frequency of spawning) do separate some populations of the two types, but these do not separate all brown trout from all sea trout. Trewavas favoured the view that the forms are ecotypes of a single species, although there are difficulties attendant on the application of even this generalized |
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