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Mass-marking of brown trout ( Salmo trutta L.) larvae by alizarin: method and evaluation of stocking.
- Source :
-
Journal of Applied Ichthyology . Feb2008, Vol. 24 Issue 1, p44-49. 6p. 2 Charts, 1 Graph, 1 Map. - Publication Year :
- 2008
-
Abstract
- This study describes otolith marking of brown trout ( Salmo trutta L.) larvae by immersion in different solutions of alizarin red S (ARS). The best results were obtained after marking with ARS at a concentration of 150 mg L−1. To evaluate the efficiency of stocking with brown trout fry, 10 000 20-day-old larvae were marked in years 2002 and 2003 with ARS and released 2 weeks later into sections of a river with natural brown trout reproduction. Electro-fishing surveys carried out 2 months after stocking in 2002 revealed that only 4.8% of all caught young-of-the-year trout originated from stocking; in 2003 the percentage was 8.9%. Based on the substantial natural reproduction and the low ratio of stocked to wild trout, it was recommended to discontinue stocking. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01758659
- Volume :
- 24
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Ichthyology
- Publication Type :
- Academic Journal
- Accession number :
- 28138115
- Full Text :
- https://doi.org/10.1111/j.1439-0426.2007.01038.x