Morphological abnormalities in a blue shark Prionace glauca (Chondrichthyes: Carcharhinidae) foetus from southern Brazil

2006 ◽  
Vol 69 (6) ◽  
pp. 1881-1884 ◽  
Author(s):  
P. L. Mancini ◽  
A. L. Casas ◽  
A. F. Amorim
2020 ◽  
Vol 48 (1) ◽  
pp. 141-145
Author(s):  
Keny Kanagusuku ◽  
Miguel Romero ◽  
Sergio Ramírez-Amaro

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.


1998 ◽  
Vol 49 (7) ◽  
pp. 621 ◽  
Author(s):  
A. F. Amorim ◽  
C. A. Arfelli ◽  
L. Fagundes

From 1974 to 1997 elasmobranchs caught by longliners based in Santos City, São Paulo State, Brazil, have been identified and the biology of some of the species has been studied. The fleet has fished since 1968, and in 1996 comprised 16 boats operating in the area 17–35ºS,27–52ºW. Since 1977 yields of sharks have shown an increasing trend, reaching ~60% of the longline total catch in 1993. Blue shark (Prionace glauca) was the main species and responsible for about 30% of the total catch of the Santos longliners. The 33 shark and 2 ray species identified belonged to the following families and genera: Alopiidae (Alopias), Carcharhinidae (Carcharhinus, Galeocerdo, Prionace) Hexanchidae (Heptranchias, Hexanchus), Lamnidae (Isurus, Lamna), Megachasmidae (Megachasma), Odontaspididae (Carcharias, Odontaspis), Pseudocarchariidae (Pseudocarcharias), Rhincodontidae (Rhincodon), Sphyrnidae (Sphyrna), Squalidae (Squaliolus, Etmopterus, Isistius), Dasyatidae (Dasyatis) and Mobulidae (Mobula). Abundance, reproduction and other biological aspects of some of the species are presented. Resumo. Estudou-se os elasmobrânquios capturados pelos atuneiros sediados em Santos. Esta frota, que utiliza o espinhel como arte de pesca, vem pescando desde 1968 no sudeste e sul do Brasil, sendo que em 1996 haviam 16 barcos, operando na área 17-35ºS,27-52ºW. Desde 1977 a produção de tubarões apresentou tendência crescente, atingindo 60% do total da captura em 1993. O cação-azul (Prionace glauca) foi o principal responsável pelo aumento das capturas de tubarões, representando cerca de 30 % do total da captura dessa frota. Identificou-se, no período de 1974 a 1997, 33 espécies de tubarão e duas de raia, pertencentes às seguintes famílias e gêneros: Alopiidae (Alopias), Carcharhinidae (Carcharhinus, Galeocerdo, Prionace) Hexanchidae (Heptranchias, Hexanchus), Lamnidae (Isurus, Lamna), Megachasmidae (Megachasma), Odontaspididae (Carcharias, Odontaspis), Pseudocarchariidae (Pseudocarcharias), Rhincodontidae (Rhincodon), Sphyrnidae (Sphyrna), Squalidae (Squaliolus, Etmopterus, Isistius), Dasyatidae (Dasyatis) and Mobulidae (Mobula). Apresentam-se análises da pesca, da reprodução e de outros aspectos biológicos de algumas espécies.


2012 ◽  
Vol 17 (1) ◽  
pp. 83-92 ◽  
Author(s):  
N Rabehagasoa ◽  
A Lorrain ◽  
P Bach ◽  
M Potier ◽  
S Jaquemet ◽  
...  

Author(s):  
Y Fujinami ◽  
K Shiozaki ◽  
Y Hiraoka ◽  
Y Semba ◽  
S Ohshimo ◽  
...  

1987 ◽  
Vol 65 (5) ◽  
pp. 1275-1281 ◽  
Author(s):  
George W. Benz ◽  
Kevin S. Dupre

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.


Author(s):  
Sushmita Mukherji ◽  
Jonathan Smart ◽  
Brooke D’Alberto ◽  
Leontine Baje ◽  
Andrew Chin ◽  
...  

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