Fuzzy logic analyses for the spawner-recruitment relationship of bigeye tuna (Thunnus obesus) in the Indian Ocean incorporating the environmental regime shift

Tom Nishida, Ding-Geng Chen and Masahiko Mohri

Ecological Modelling, 2007, vol. 203, issue 1, 132-140

Abstract: The vertical sea temperature (VST) in the 0–40m depth range for bigeye tuna (Thunnus obesus) inhabitation affects production of the spawning eggs. We then incorporate this VST along with regime shift into the original Ricker spawner-recruit (SR) model with two extended methods, i.e., the regime SR model and the fuzzy logic SR model. The three models are compared and evaluated using the bigeye tuna (T. obesus) SR data in the Indian Ocean from 1960 to 2001 obtained from the age-specific production model analyses.

Keywords: Fuzzy logic; Bigeye tuna; Indian Ocean; Spawner-recruit relation; Regime shift; Ricker model (search for similar items in EconPapers)
Date: 2007
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:ecomod:v:203:y:2007:i:1:p:132-140

DOI: 10.1016/j.ecolmodel.2005.11.049

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