Reproductive biology of male skipjack tuna Katsuwonus pelamis (Linnaeus) in the tropical western and central Pacific Ocean

2010 ◽  
Vol 76 (5) ◽  
pp. 785-793 ◽  
Author(s):  
Hiroshi Ashida ◽  
Toshiyuki Tanabe ◽  
Keisuke Satoh ◽  
Atsushi Fukui ◽  
Sho Tanaka ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Reproductive Biology ◽  
Skipjack Tuna ◽  
Central Pacific ◽  
Katsuwonus Pelamis ◽  
Central Pacific Ocean

scholarly journals Combining Weight-Length Relationships and condition factors to estimate the population structure for Skipjack tuna in the Western and Central Pacific Ocean

2014 ◽  
Author(s):  
Shaofei Jin ◽  
Xiaodong Yan ◽  
Heng Zhang ◽  
Wei Fan
Keyword(s):  
Population Structure ◽  
Pacific Ocean ◽  
Fork Length ◽  
Skipjack Tuna ◽  
Growth Phases ◽  
Central Pacific ◽  
Katsuwonus Pelamis ◽  
Central Pacific Ocean ◽  
Length Relationship ◽  
June July

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.

scholarly journals Spawning frequency and batch fecundity of skipjack tuna Katsuwonus pelamis in the tropical west-central Pacific Ocean

2008 ◽  
Vol 74 (5) ◽  
pp. 802-808 ◽  
Author(s):  
HIROSHI ASHIDA ◽  
TOSHIYUKI TANABE ◽  
NOBUHIRO SUZUKI ◽  
ATSUSHI FUKUI ◽  
SHO TANAKA
Keyword(s):  
Pacific Ocean ◽  
Skipjack Tuna ◽  
Batch Fecundity ◽  
Central Pacific ◽  
Katsuwonus Pelamis ◽  
Central Pacific Ocean ◽  
Spawning Frequency ◽  
West Central

scholarly journals No Population Genetic Structure of Skipjack Tuna (Katsuwonus pelamis) in the Tropical Western and Central Pacific Assessed Using Single Nucleotide Polymorphisms

2020 ◽  
Vol 7 ◽  
Author(s):  
Giulia Anderson ◽  
Monal Lal ◽  
Brian Stockwell ◽  
John Hampton ◽  
Neville Smith ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Population Size ◽  
Population Genomics ◽  
Biological Significance ◽  
Fine Scale ◽  
Skipjack Tuna ◽  
Central Pacific ◽  
Katsuwonus Pelamis ◽  
Central Pacific Ocean ◽  
Basin Scale

Skipjack tuna (Katsuwonus pelamis) has historically been considered panmictic at the ocean basin scale because of the species’ life history and substantial absolute population size. However, recent advances in population genomics have enabled scientists to demonstrate population structure in other species that were likewise traditionally assumed to be panmictic. Accordingly, we used DArTseq, a proprietary platform of reduced-representation genome sequencing developed by Diversity Arrays Technology (DArTech) to genotype 222 skipjack tuna from 9 sample groups collected across 6 exclusive economic zones (EEZs) and over 6 years in the tropical Western and Central Pacific Ocean. This is one of the most fine-scale population genetics assessments of skipjack tuna to date. We found several statistically significant pairwise FST comparisons using purportedly neutral loci, but very little indication of structure based on observed and expected heterozygosity, effective population size, a Mantel test, AMOVA, numerous genetic clustering and population assignment tests, and exploration of correlation with oceanographic features. Significant pairwise FST values were often shallow and resulted in uncertainty about their biological significance. Furthermore, a test of the hypothesis that the geographic and temporal distribution of the potentially adaptive genetic diversity may depict cryptic fine scale structure using two different outlier detection methods, could not reject panmixia based on estimates of fixation indices and two clustering software. Our results support the presence of a single population of skipjack tuna in the tropical Western and Central Pacific Ocean, but highly recommend the expansion of the study area, in latitude, longitude, and seasonality, before drawing any global conclusions.

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