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- Title
Comparisons of two research vessels' properties in the acoustic surveys of small pelagic fish.
- Authors
LEONORI, Iole; TIČINA, Vjekoslav; DE FELICE, Andrea; PALLAORO, Armin; GRUBIŠIĆ, Leon; GRUBISI, Olja VIDJAK Leon
- Abstract
Acoustic surveys in the Adriatic Sea have been performed annually by the research vessels "Dallaporta" and "Bios", equipped with SIMtL4D echo-sounders (EK-500 and EK-60), and working with 38 kHz split-beam transducer (ES38B). Since the vessels have different characteristics and use different pelagic trawls for fish sampling, there is uncertainty regarding the comparability of the results obtained. In order to evaluate comparability of the results, a comparison between research vessels was performed. That included comparisons of vessels' noise, acoustic data collection, and fish samples composition and size structure analyses. The noise generated by both vessels was sufficiently low to allow a single fish detection up to 200 m depth. Acoustic data collected by the two vessels showed similar trends, no significant differences in average SA-values, and highly significant correlation between SA-values. Therefore, unbiased acoustic data collected by vessels could be combined in future stock assessments. Concerning collection offish samples, anchovy resulted as the most abundant species in the samples collected by both vessels even if size compositions of anchovy were significantly different.
- Subjects
ADRIATIC Sea; RESEARCH vessels; PELAGIC fishes; ACOUSTIC surface waves; ACQUISITION of data; FISH detection; AQUATIC resources
- Publication
Acta Adriatica, 2012, Vol 53, Issue 3, p389
- ISSN
0001-5113
- Publication type
Article