Oxygen utilization and the branchial pressure gradient during ram ventilation of the shortfin mako, Isurus oxyrinchus: is lamnid shark-tuna convergence constrained by elasmobranch gill morphology?

2011 ◽  
Vol 215 (1) ◽  
pp. 22-28 ◽  
Author(s):  
N. C. Wegner ◽  
N. C. Lai ◽  
K. B. Bull ◽  
J. B. Graham
Keyword(s):  
Pressure Gradient ◽  
Oxygen Utilization ◽  
Isurus Oxyrinchus ◽  
Shortfin Mako ◽  
Gill Morphology ◽  
Ram Ventilation

Growth and spatiotemporal distribution of juvenile shortfin mako (Isurus oxyrinchus) in the western and central North Pacific

2015 ◽  
Vol 66 (12) ◽  
pp. 1176 ◽  
Author(s):  
M. Kai ◽  
K. Shiozaki ◽  
S. Ohshimo ◽  
K. Yokawa
Keyword(s):  
North Pacific ◽  
Linear Models ◽  
North Pacific Ocean ◽  
Age Groups ◽  
Growth Curves ◽  
Growth Function ◽  
Gaussian Mixture ◽  
Isurus Oxyrinchus ◽  
Shortfin Mako ◽  
Central North Pacific

This paper presents an estimation of growth curves and spatiotemporal distributions of juvenile shortfin mako shark (Isurus oxyrinchus) in the western and central North Pacific Ocean using port sampling data collected from 2005 to 2013. The monthly length compositions show a clear transition of three modes in the size range of smaller than 150-cm precaudal length (PCL), which were believed to represent the growth of age-0 to age-2 classes, and they were then decomposed into age groups by fitting a Gaussian mixture distribution. Simulation data of lengths at monthly ages were generated from the mean and standard deviation of each distribution, and fit with a von Bertalanffy growth function. Parameters of the estimated growth curves for males and females were 274.4 and 239.4cm PCL for the asymptotic length and 0.19 and 0.25 year–1 for the growth coefficient indicating apparently faster growth than previously reported. Generalised linear models were applied to age-0 to explore the seasonal changes of PCL by area. They were born during late autumn and winter off the coast of north-eastern Japan, an area known to have relatively high productivity compared with other pelagic areas, and gradually expanded their habitat eastward and northward with the seasons as they grew.

Age and growth of the shortfin mako (Isurus oxyrinchus) in the south-eastern Pacific off Chile

2009 ◽  
Vol 60 (5) ◽  
pp. 394 ◽  
Author(s):  
Francisco Cerna ◽  
Roberto Licandeo
Keyword(s):  
Growth Parameters ◽  
Eastern Pacific ◽  
Age And Growth ◽  
The South ◽  
Age Classes ◽  
Vertebral Centra ◽  
South Eastern ◽  
Isurus Oxyrinchus ◽  
Shortfin Mako ◽  
Longline Fisheries

The shortfin mako, Isurus oxyrinchus, is a large pelagic shark with a widespread global distribution. However, very little is known about most aspects of this species for the south-eastern Pacific. In the present paper, the age and growth parameters of the shortfin mako, caught by Chilean swordfish longline fisheries from 2004 to 2005, are reported. Ages were estimated by counting band-pairs from sections of vertebral centra from 547 individuals, ranging from 76 to 330 cm in total length (TL). Trends in the proportion of opaque edges for all ages combined and grouped into ages 0–6 and 7–26 years indicated that they are formed during summer and showed that annually, one band-pair is formed in the vertebrae of shortfin makos. Modal-progression analysis was used to verify the first three age classes (ages 0–2 years). For both sexes, the oldest estimated age was 25+ years. Von Bertalanffy growth parameters were estimated at L∞ = 325.29 cm TL, K = 0.076 year–1 and t0 = –3.18 years for females and L∞ = 296.60 cm TL, K = 0.087 year–1 and t0 = –3.58 years for males. The results indicated that this species is highly vulnerable to exploitation and, thus, urgent conservation measures are required.

In situ observation of stomach eversion in a line-caught Shortfin Mako (Isurus oxyrinchus)

2011 ◽  
Vol 109 (1) ◽  
pp. 212-216 ◽  
Author(s):  
Juerg M. Brunnschweiler ◽  
Frank Nielsen ◽  
Philip Motta
Keyword(s):  
In Situ Observation ◽  
Isurus Oxyrinchus ◽  
Shortfin Mako

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.

Functional morphology of the gills of the shortfin mako, Isurus oxyrinchus, a lamnid shark

2010 ◽  
pp. n/a-n/a ◽  
Author(s):  
Nicholas C. Wegner ◽  
Chugey A. Sepulveda ◽  
Kenneth R. Olson ◽  
Kelly A. Hyndman ◽  
Jeffrey B. Graham
Keyword(s):  
Functional Morphology ◽  
Isurus Oxyrinchus ◽  
Shortfin Mako
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