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

Author(s):  
Sushmita Mukherji ◽  
Jonathan Smart ◽  
Brooke D’Alberto ◽  
Leontine Baje ◽  
Andrew Chin ◽  
...  
Author(s):  
María del Pilar Blanco-Parra ◽  
Felipe Galván-Magaña ◽  
Fernando Márquez-Farías

2004 ◽  
Vol 66 (1) ◽  
pp. 19-30 ◽  
Author(s):  
Rosângela Lessa ◽  
Francisco M Santana ◽  
Fábio H Hazin

2019 ◽  
Vol 211 ◽  
pp. 238-246 ◽  
Author(s):  
I. Andrade ◽  
D. Rosa ◽  
R. Muñoz-Lechuga ◽  
R. Coelho

2017 ◽  
Vol 68 (6) ◽  
pp. 1130 ◽  
Author(s):  
R. J. David Wells ◽  
Natalie Spear ◽  
Suzanne Kohin

The blue shark (Prionace glauca) is subjected to high levels of fishery catch and by-catch worldwide; thus, knowledge of their productivity and population status is vital, yet basic assumptions of band-pair deposition rates in vertebrae used for age and growth models are being made without direct validation studies in the Pacific Ocean. As such, the purpose of the present study was to validate vertebral band-deposition rates of blue sharks tagged and recaptured in the eastern Pacific Ocean. Vertebrae of 26 blue sharks marked with oxytetracycline (OTC) were obtained from tag–recapture activities to determine timing of centrum growth-band deposition. Results from band counts distal to the OTC mark on each vertebra indicated that a single band pair (1 translucent and 1 opaque) is formed per year for blue sharks ranging from 1 to 8 years of age. Length–frequency modal analysis was also used to obtain growth estimates from a dataset spanning 26 years of research and commercial catch data. Results provide support for annual band-pair deposition in blue shark vertebrae and will aid in future blue shark age and growth studies in the Pacific Ocean.


Ciencia Unemi ◽  
2016 ◽  
Vol 9 (19) ◽  
pp. 106
Author(s):  
Marcos Calle Moran ◽  
Ruben Castro Rendon ◽  
Isabel Garcia Arevalo ◽  
Andrea Cucalon Hidalgo

El tiburón azul Prionace glauca es una especie que representa gran importancia económica y ecológica. A pesar de dicha relevancia, la información acerca de biología y demás aspectos relacionados con esta población son escasos, la misma que es necesaria para un manejo adecuado de sus pesquerías. El objetivo de este trabajo fue elaborar una revisión histórica de todos los estudios biológicos, ecológicos y toxicólogicos llevados a cabo en los ecosistemas costeros y marinos del Pacífico ecuatoriano. Se realizó una revisión bibliográfica de diversos documentos como tesis, informes técnicos, publicaciones científicas, entre otros. De acuerdo con resultados obtenidos, en Ecuador se han efectuado cuatro estudios de investigación científica a partir de 2012: dos de Biología (uno de aspectos reproductivos para Santa Rosa de Salinas y otro de edad y crecimiento para Manta), y dos de Ecología y Toxicología (uno sobre la bioacumulación y biomagnificación de mercurio, y otro sobre la concentración de mercurio y cadmio; ambos realizados en Santa Rosa de Salinas). Los trabajos fueron desarrollados por universidades estatales y privadas a través de tesis, mientras que un borrador de publicación científica estaba en preparación, como parte de un proyecto de investigación de una institución de educación superior particular. Abstract Blue shark Prionace glauca is a species that represents a great economic and ecological importance. However, the information related to its biology and others aspects of its population is limited. Nevertheless these kinds of studies are very important for a suitable management of fishery activities. The aim of this research was to develop a historical review for all biological, ecological and toxicological studies made in the coastal and marine ecosystems of the Ecuadorian Pacific. A review of the specialized literature was carried out for many documents such as thesis, technical reports, scientific papers, and others. According to results obtained, in Ecuador there have been four scientific research studies from 2012: These were two of Biology (one of reproductive aspects in Santa Rosa de Salinas and another about age and growth in Manta) and the others two of Ecology and Toxicology (one on mercury bioaccumulation and bio-magnification of mercury, and another on the concentration of mercury and cadmium; both conducted in Santa Rosa de Salinas). The works were developed by state and private universities through thesis, while a draft was in preparation for scientific publication as part of a research project in a private institution of higher education. 


2018 ◽  
Vol 69 (9) ◽  
pp. 1346
Author(s):  
Shoou-Jeng Joung ◽  
Guann-Tyng Lyu ◽  
Hua-Hsun Hsu ◽  
Kwang-Ming Liu ◽  
Shyh-Bin Wang

The age and growth of the blue shark Prionace glauca in the central South Pacific is described based on 267 specimens that were collected by scientific observers on board Taiwanese large-scale tuna longline fleets between May 2009 and May 2011. Growth band pairs (identified as translucent and opaque bands) were counted on images photographed from X-ray films of the vertebrae from the caudal peduncle region. The marginal increment ratio and centrum edge analysis indicated that a growth band pair was formed on the vertebral centrum once per year. The band pairs after the birthmark were counted from 2 to 11 for females and from 2 to 15 for males. The bias corrected Akaike information criterion indicated that the von Bertalanffy growth function (VBGF) best fitted the observed total length (TL)-at-age data. The parameters of sex-specific VBGF were estimated as follows: for females, theoretical maximum length (L∞) mean±s.d.=330.4±46.6cm TL, growth coefficient k=0.164±0.057year–1 and theoretical age at length 0 (t0)=–1.29±0.78 years; for males, L∞=376.6±32.6cm TL, k=0.128±0.022year–1 and t0=–1.48±0.54 years. The longevities were estimated to be at least 16.8 and 21.6 years for females and males respectively.


Author(s):  
Donald Denoon ◽  
Kathleen Dugan ◽  
Leslie Marshall

1984 ◽  
Vol 29 (10) ◽  
pp. 786-788
Author(s):  
Patricia M. Greenfield

2012 ◽  
Author(s):  
Esteban Tristan ◽  
Mei-Chuan Kung ◽  
Peter Caccamo

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