Effects of diel period and diurnal cloud cover on the species selection of short and long penaeid trawls

Broadhurst, Matt K., Sterling, David J. and Millar, Russel B. (2015) Effects of diel period and diurnal cloud cover on the species selection of short and long penaeid trawls. Fisheries Research, 170 144-151. doi:10.1016/j.fishres.2015.05.027


Author Broadhurst, Matt K.
Sterling, David J.
Millar, Russel B.
Title Effects of diel period and diurnal cloud cover on the species selection of short and long penaeid trawls
Journal name Fisheries Research   Check publisher's open access policy
ISSN 0165-7836
1872-6763
Publication date 2015-10
Sub-type Article (original research)
DOI 10.1016/j.fishres.2015.05.027
Volume 170
Start page 144
End page 151
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2016
Language eng
Formatted abstract
Diel period and diurnal cloud cover (i.e. ambient light) were tested for their importance in explaining variability in the relative selectivity of two penaeid trawls that differed only in their side tapers (1N3B or ‘long’ and ∼28̊ to the tow direction vs 1N5B or ‘short’ and ∼35̊). The trawls were tested in an Australian estuarine fishery during paired deployments (n = 44) across replicate nights and during days with variable cloud cover (categorized as <50 and >50%). Catches were dominated by the targeted school prawns, Metapenaeus macleayi and seven teleosts. Only two teleosts (southern herring, Herklotsichthys castelnaui and Australian anchovy, Engraulis australis) along with the school prawns were significantly affected by trawl side taper, with all retained in lower numbers by the short trawl. For school prawns and Australian anchovy, their catch reductions mostly remained consistent irrespective of diel phase and diurnal cloud cover, but southern herring (mostly smaller individuals) only escaped from the short trawl during diurnal deployments and with <50% cloud; possibly through anterior meshes in response to more available ambient light. The results highlight the importance of environmental parameters for affecting the selectivity of penaeid trawls, and have implications for their ongoing refinement and use as survey tools.
Keyword Bycatch reduction
Diel effects
Netting taper
Penaeids
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Biological Sciences Publications
 
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