scholarly journals Multiple morphological abnormalities in a blue shark Prionace glauca (Linnaeus, 1758) embryo from the Peruvian coast, southeast Pacific

2020 ◽  
Vol 48 (1) ◽  
pp. 141-145
Author(s):  
Keny Kanagusuku ◽  
Miguel Romero ◽  
Sergio Ramírez-Amaro
Keyword(s):  
Cephalic Region ◽  
Blue Shark ◽  
Caudal Fin ◽  
Prionace Glauca ◽  
Morphological Abnormalities ◽  
Peruvian Coast ◽  
Southeast Pacific ◽  
First Time

This study reports for the first time a case of multiple morphological abnormalities in a blue shark Prionace glauca embryo collected on the Peruvian coast, southeast Pacific. External exploration and radiograph picture showed duplicated parts in the cephalic region (mouths and eye sockets) and trunk anomalies (thoracic lordosis and rolled caudal fin). The duplicate face parts in a single head seen in the embryo, suggest a diprosopia anomaly.

Tendon structure of the Caudal Fin in the Blue Sharkd, Prionace glauca

1992 ◽  
Vol 43 (1) ◽  
pp. 149
Author(s):  
ED Keithan ◽  
JY Ma ◽  
W Rashi
Keyword(s):  
Tensile Strength ◽  
Quantitative Analysis ◽  
Qualitative Description ◽  
Nuclear Density ◽  
Muscular Force ◽  
Collagen Fibres ◽  
Blue Shark ◽  
Caudal Fin ◽  
Prionace Glauca ◽  
Caudal Lobe

A qualitative description of the myology of three blue shark (Prionace glauca) caudal fins is presented, forming the basis for a quantitative analysis of the tendon structure. The primary musculature consists of dorsal epaxial and ventral hypaxial portions. The average crimp angle of collagen fibres in the epaxial tendons (14.1-26.8�) is significantly greater (P<0.01) than that in the hypaxial tendons (1.8-14.5�). Similarly, epaxial tendons exhibit a significantly lower fibrocyte nuclear density (0.02- 0.03 nuclei �m-2) than do the corresponding hypaxial tendons (0.05-0.08 nuclei �m-2) (P < 0.01). The greater crimp angle and lower fibrocyte nuclear density in epaxial tendons indicate increased tensile strength, consistent with the comparatively greater muscular force required to move the upper caudal lobe.

Isotopic niches of the blue shark Prionace glauca and the silky shark Carcharhinus falciformis in the southwestern Indian Ocean

2012 ◽  
Vol 17 (1) ◽  
pp. 83-92 ◽  
Author(s):  
N Rabehagasoa ◽  
A Lorrain ◽  
P Bach ◽  
M Potier ◽  
S Jaquemet ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Blue Shark ◽  
Prionace Glauca ◽  
Silky Shark ◽  
Carcharhinus Falciformis ◽  
Southwestern Indian Ocean

Seasonal migrations of pregnant blue shark Prionace glauca in the northwestern Pacific

2020 ◽  
Author(s):  
Y Fujinami ◽  
K Shiozaki ◽  
Y Hiraoka ◽  
Y Semba ◽  
S Ohshimo ◽  
...  
Keyword(s):  
Northwestern Pacific ◽  
Blue Shark ◽  
Prionace Glauca ◽  
Seasonal Migrations

Spatial distribution of the parasite Kroyeria carchariaeglauci Hesse, 1879 (Copepoda: Siphonostomatoida: Kroyeriidae) on gills of the blue shark (Prionace glauca (L., 1758))

1987 ◽  
Vol 65 (5) ◽  
pp. 1275-1281 ◽  
Author(s):  
George W. Benz ◽  
Kevin S. Dupre
Keyword(s):  
Spatial Distribution ◽  
Natural Selection ◽  
Distribution Pattern ◽  
Surface Area ◽  
Blue Shark ◽  
Prionace Glauca ◽  
Homogeneous Groups ◽  
Secondary Lamellae ◽  
Gill Filaments ◽  
Gill Surface Area

Five blue sharks (Prionace glauca) were examined for gill-infesting copepods. Three species of siphonostomatoid copepods were collected: Gangliopus pyriformis, Phyllothyreus cornutus, and Kroyeria carchariaeglauci. The spatial distribution of K. carchariaeglauci was analyzed. The number of K. carchariaeglauci per shark was positively related to gill surface area and host size. Copepods were unevenly distributed amongst hemibranchs; flanking hemibranchs could be arranged into three statistically homogeneous groups. Female K. carchariaeglauci typically attached themselves within the middle 40% of each hemibranch; males were more evenly dispersed. Eighty percent of all K. carchariaeglauci attached themselves to secondary lamellae, the remainder were in the underlying excurrent water channels. Most K. carchariaeglauci were located between 10 and 25 mm along the lengths of gill filaments. Overall, the spatial distribution of K. carchariaeglauci was quite specific in all study planes. Explanation of this distribution is set forth in terms of natural selection pressures; however, the equally plausible explanation that the distribution pattern exhibited by these copepods is phylogenetically determined and may have little to do with contemporary selective constraints should not be ignored.

Preliminary age and growth estimates of the blue shark (Prionace glauca) from Papua New Guinea

2021 ◽  
Author(s):  
Sushmita Mukherji ◽  
Jonathan Smart ◽  
Brooke D’Alberto ◽  
Leontine Baje ◽  
Andrew Chin ◽  
...  
Keyword(s):  
Papua New Guinea ◽  
New Guinea ◽  
Age And Growth ◽  
Blue Shark ◽  
Prionace Glauca
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