Do local environmental factors induce daily and yearly variability in bluefin tuna (Thunnus thynnus) trap catches?

Lemos, RT and Gomes, JF (2004) Do local environmental factors induce daily and yearly variability in bluefin tuna (Thunnus thynnus) trap catches?. Ecological Modelling, 177 1-2: 143-156. doi:10.1016/j.ecolmodel.2004.02.005


Author Lemos, RT
Gomes, JF
Title Do local environmental factors induce daily and yearly variability in bluefin tuna (Thunnus thynnus) trap catches?
Formatted title
Do local environmental factors induce daily and yearly variability in bluefin tuna (Thunnus thynnus) trap catches?
Journal name Ecological Modelling   Check publisher's open access policy
ISSN 0304-3800
1872-7026
Publication date 2004-09-15
Sub-type Article (original research)
DOI 10.1016/j.ecolmodel.2004.02.005
Volume 177
Issue 1-2
Start page 143
End page 156
Total pages 14
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Abstract The daily influence of local environmental factors on bluefin tuna fisheries in Portugal was investigated by analysing catches made at two traps, Barril and TUNIPEX. A ‘hurdle’ geometric regression model was fitted, since this class of generalized linear models can deal with zero-inflated data such as daily trap catches. With this model, the influence of environmental factors on the probability of catching tuna and on the expected size of positive catches were analysed separately. Parameter estimation utilized data from the oldest trap (1926–1966) only, whereas data from the more recent trap (1996–2000) was used to validate the model. The obtained results were in agreement with many previously formulated hypotheses regarding the ecology of bluefin tuna, in aspects such as the impacts of turbidity and wind- and tidal-generated currents on the presence of schools close to shore, where they can be caught by traps. Through simulation, it was further found that periodic oscillations observed in yearly trap catches are probably associated with local weather and coastal ocean variability.
Keyword Tuna
Ecology
Periodic fluctuations
Fishery
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
 
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Created: Tue, 24 Jan 2012, 13:43:33 EST by Ricardo Silva Tavares De Lemos on behalf of Mathematics