Microsatellite analysis of population structure in the shortfin mako (Isurus oxyrinchus)

2003 ◽  
Vol 60 (6) ◽  
pp. 670-675 ◽  
Author(s):  
Aaron W Schrey ◽  
Edward J Heist
Keyword(s):  
Population Structure ◽  
Microsatellite Analysis ◽  
Population Subdivision ◽  
Mako Shark ◽  
The North ◽  
Isurus Oxyrinchus ◽  
Shortfin Mako ◽  
Weak Evidence ◽  
Female Dispersal ◽  
High Level

Microsatellite analysis of the shortfin mako shark (Isurus oxyrinchus) revealed very weak evidence of population structure. Samples collected from the North Atlantic, South Atlantic, North Pacific, South Pacific, and Atlantic, and Pacific coasts of South Africa were screened at four microsatellite loci. Multilocus measures of population subdivision were much lower than expected (FST = 0.0014, P = 0.1292; RST = 0.0029, P = 0.019). Power analysis revealed that the study had a high level of power (>0.995) to detect the magnitude of FST expected based on a previous study of mtDNA and assumptions of equal male and female dispersal. Thus, integrating the results from microsatellite- and mitochondrial-based studies may provide evidence for gender-biased dispersal for the shortfin mako.

Evaluating the impacts of uncertainty on the estimation of biological reference points for the shortfin mako shark, Isurus oxyrinchus, in the north-western Pacific Ocean

2011 ◽  
Vol 62 (12) ◽  
pp. 1383 ◽  
Author(s):  
Wen-Pei Tsai ◽  
Chi-Lu Sun ◽  
Sheng-Ping Wang ◽  
Kwang-Ming Liu
Keyword(s):  
Life History ◽  
Reference Points ◽  
Mako Shark ◽  
Stock Status ◽  
The North ◽  
Isurus Oxyrinchus ◽  
Length Relationship ◽  
Shortfin Mako ◽  
North Western ◽  
North Western Pacific

Biological reference points (BRPs) are commonly used to assess the harvest level and stock status of marine fish populations. However, BRP estimates may be influenced by uncertainties about life-history parameters and fishing practices. The shortfin mako shark, Isurus oxyrinchus, is one of the most important by-catch species for tuna longline fisheries; however, its stock status remains poorly understood. To understand its population dynamics, the present study examined fishery statistics data and biological measurements of the shortfin mako in the north-western Pacific, and evaluated the impact of uncertainties associated with various sources of uncertainty, by using a simulation approach. The simulations indicated that BRPs are especially sensitive to changes in weight–length relationship and the growth parameters. Failure to take this into account may lead to inaccurate estimates and have serious consequences for management decision-making. To improve the accuracy of BRP estimates, biological measurements and life-history parameters should be updated regularly to account for changes in size composition and population structure. Further research could focus on increasing the sex-ratio sample size, updating the weight–length relationship and growth equations, incorporating ageing error into BRP calculations and determining BRPs by using appropriate levels of spawning-potential ratio.

scholarly journals Spatiotemporal variation in size-structured populations using fishery data: an application to shortfin mako (Isurus oxyrinchus) in the Pacific Ocean

2017 ◽  
Vol 74 (11) ◽  
pp. 1765-1780 ◽  
Author(s):  
Mikihiko Kai ◽  
James T. Thorson ◽  
Kevin R. Piner ◽  
Mark N. Maunder
Keyword(s):  
Coastal Waters ◽  
Mixed Model ◽  
Linear Mixed Model ◽  
Marine Species ◽  
Structured Populations ◽  
Spatiotemporal Model ◽  
The North ◽  
Isurus Oxyrinchus ◽  
Shortfin Mako ◽  
Catch Rates

We develop a length-disaggregated, spatiotemporal, delta-generalized linear mixed model (GLMM) and apply the method to fishery-dependent catch rates of shortfin mako sharks (Isurus oxyrinchus) in the North Pacific. The spatiotemporal model may provide an improvement over conventional time-series and spatially stratified models by yielding more precise and biologically interpretable estimates of abundance. Including length data may provide additional information to better understand life history and habitat partitioning for marine species. Nominal catch rates were standardized using a GLMM framework with spatiotemporal and length composition data. The best-fitting model showed that most hotspots for “immature” shortfin mako occurred in the coastal waters of Japan, while hotspots for “subadult and adult” occurred in the offshore or coastal waters of Japan. We also found that size-specific catch rates provide an indication that there has been a recent increasing trend in stock abundance since 2008.

scholarly journals Erratum to: Morphological Characterization and Hydrodynamic Behavior of Shortfin Mako Shark (Isurus oxyrinchus) Dorsal Fin Denticles

2019 ◽  
Vol 16 (5) ◽  
pp. 965-965 ◽  
Author(s):  
Patricia Fernandez-Waid ◽  
Guzman Diez ◽  
Iñigo Bidaguren ◽  
Urtzi Izagirre ◽  
Jesus Maria Blanco ◽  
...  
Keyword(s):  
Morphological Characterization ◽  
Hydrodynamic Behavior ◽  
Mako Shark ◽  
Dorsal Fin ◽  
Isurus Oxyrinchus ◽  
Shortfin Mako

scholarly journals On the recent occurrences of shortfin mako shark, Isurus oxyrinchus (Rafinesque, 1810) in the Adriatic Sea

2018 ◽  
Vol 59 (2) ◽  
pp. 237-243
Author(s):  
David Udovičić ◽  
Pero Ugarković ◽  
Frane Madiraca ◽  
Branko Dragičević
Keyword(s):  
Adriatic Sea ◽  
Nursery Area ◽  
Mako Shark ◽  
Isurus Oxyrinchus ◽  
Photographic Evidence ◽  
Shortfin Mako

Eight individuals of the shortfin mako shark, Isurus oxyrinchus (Rafinesque, 1810) have been recorded in the period from 2014 to 2017 in the Adriatic Sea. The specimens presented in the paper were identified on the basis of photographic evidence. Occurrences of juvenile specimens suggests that Adriatic Sea could serve as a nursery area for this species, especially its eastern part. A review of the previously documented occurrences of this species in the Adriatic Sea is given in this article.

scholarly journals Structural studies of haemoglobin from pisces species shortfin mako shark (Isurus oxyrinchus)at 1.9 Å resolution

2013 ◽  
Vol 20 (6) ◽  
pp. 843-847 ◽  
Author(s):  
Pandian Ramesh ◽  
S. S. Sundaresan ◽  
Pon. Sathya Moorthy ◽  
M. Balasubramanian ◽  
M. N. Ponnuswamy
Keyword(s):  
Structural Studies ◽  
Mako Shark ◽  
Isurus Oxyrinchus ◽  
Shortfin Mako
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