Development of integrated habitat indices for bigeye tuna, Thunnus obesus, in waters near Palau
Yuwei Li A , Liming Song A B D , Tom Nishida C and Panfeng Gao A
+ Author Affiliations
- Author Affiliations
A College of Marine Sciences, Shanghai Ocean University, 999 Huchenghuan Road, Lingangxincheng Shanghai 201306, China.
B The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, College of Marine Sciences, Shanghai Ocean University, 999 Huchenghuan Road, Lingangxincheng Shanghai 201306, China.
C National Research Institute of Far Seas Fisheries, Fisheries Research Agency (FRA), 5-7-1 Orido, Shimizu, Shizuoka, Japan.
D Corresponding author. Email: lmsong@shou.edu.cn
Marine and Freshwater Research 63(12) 1244-1254 https://doi.org/10.1071/MF12072
Submitted: 9 March 2012 Accepted: 3 October 2012 Published: 12 December 2012
Abstract
A survey was conducted in waters near Palau in 2005, to improve our understanding of the relationship between environmental variables and the spatial distributions of Thunnus obesus. Catch rates and environmental variables (water temperature, salinity and dissolved oxygen) at six depth strata between 40 and 280 m were collected at 77 sampling stations in the survey. Models were developed to estimate an integrated habitat index (IHI) for T. obesus on the basis of quantile regression. The findings of the present study were as follows: (1) the performance of IHI models in predicting habitat utilisation by T. obesus was good, (2) the impacts of the weighted average temperature and dissolved oxygen were significant on the spatial distribution of T. obesus, (3) the influence of the environmental variables on T. obesus distribution differed among different depth strata, (4) the present study provides an effective approach to predict the spatial distribution of the pelagic fishes caught by longline and (5) the weighted average temperature and dissolved oxygen should be included in the T. obesus catch per unit effort (CPUE) standardisations.
Additional keywords : field observation data, interactions, warm-pool, west-central Pacific Ocean.
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