We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
The influence of uncertainty in target strength on abundance indices based on acoustic surveys: examples of the Baltic Sea herring and sprat.
- Authors
Kasatkina, Svetlana M.
- Abstract
Kasatkina, S. M. 2009. The influence of uncertainty in target strength on abundance indices based on acoustic surveys: examples of the Baltic Sea herring and sprat. – ICES Journal of Marine Science, 66: 1404–1409.In situ, target-strength (TS) measurements at 38 kHz and an analysis of biometric fish characteristics are presented for the Baltic Sea herring (Clupea harengus membras) and sprat (Sprattus sprattus). It is demonstrated that the application of two TS–length functions for the Baltic Sea clupeids, the first for young herring and sprat and the second for adult herring, is reasonable, and the two functions can therefore replace the well-known equation used since 1983. Parameters of the proposed relationships, accompanied by their statistical characteristics, are included in a model to obtain uncertainty in acoustically derived abundance indices. Major components of survey uncertainty, such as spatial variability, species composition, and size structure, are also included in the simulation. The proposed TS functions should permit estimates of more realistic abundance dynamics of Baltic Sea clupeids, by years and age groups, thereby providing important information for stock assessment models.
- Subjects
BALTIC Sea; PACIFIC herring fisheries; BIOMETRY; EQUATIONS; FISH sounds; FISH stocking
- Publication
ICES Journal of Marine Science / Journal du Conseil, 2009, Vol 66, Issue 6, p1404
- ISSN
1054-3139
- Publication type
Article
- DOI
10.1093/icesjms/fsp086