Combining Weight-Length Relationships and condition factors to estimate the population structure for Skipjack tuna in the Western and Central Pacific Ocean
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Abstract
The arguments between Weight-Length Relationship (WLR) and Condition Factor (K) have been lasted since the day they occurred. This paper described WLRs and Ks of Skipjack tuna (Katsuwonus pelamis) samples in Purse Seine fisheries from three cruises (August-September cruise (A-S) in 2009, November-December cruise (N-D) in 2012, and June-July cruise (J-J) in 2013) in the Central and Western Pacific Ocean (CWPO). The results showed that fork length of more than 70% of specimen was below 60 cm (76% in A-S, 87% in N-D, and 73% in J-J). b values of WLRs in class of fork length > 60cm were below 3 significantly (P = 0.062), while b values when fork length < 60 cm were > 3 significantly (P = 0.028). Moreover, K values in different fork length classes for each cruises had one turning point: 60-65cm for J-J, 60-65cm for N-D, and 55-60cm for A-S, and K values were still significantly larger than those of fork length < 40cm (P = 0.06). However, b values at larger fishes were significantly smaller than those of fork length <40cm. We suggest to combine WLRs and K values at different growth phases for evaluating population structure for skipjack tuna.
Cite this as
2014. Combining Weight-Length Relationships and condition factors to estimate the population structure for Skipjack tuna in the Western and Central Pacific Ocean. PeerJ PrePrints 2:e610v1 https://doi.org/10.7287/peerj.preprints.610v1note This preprint is not peer-reviewed. You may wish to reference the subsequent peer-reviewed version of this article.
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This is a submission to PeerJ for review.
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Supplemental Information
Raw data of fork length(cm), weight(g), and locations over all cruises in this study
Sheet 1 is the raw data of fork length, weight in different cruies, sheet 2 is the location information of different sampling staitons, sheet 3 is the dataset of length-weight relationships of skipjack tuna from the FishBase, and sheet 4 is the explanations for all the symbols in the sheets.
Additional Information
Competing Interests
The authors declare they have no competing interests.
Author Contributions
Shaofei Jin conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.
Xiaodong Yan analyzed the data, reviewed drafts of the paper.
Heng Zhang conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, reviewed drafts of the paper.
Wei Fan conceived and designed the experiments, analyzed the data, reviewed drafts of the paper.
Animal Ethics
The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):
The study was carried out on commercial fishery vessels, governed and monitored by the WCPFC (Western and Central Pacific Fisheries Commission). All information related to skipjack tunas were reported to the WCPFC.
Funding
This study was funded by Natural Science Foundation of China (Grant No. 51339004), Shanghai Science and technology innovation action plan (Grant No. 12231203901), and National science and technology support program (Grant No. 2013BAD13B01). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.