نتایج جستجو برای: shark
تعداد نتایج: 4177 فیلتر نتایج به سال:
This study aimed to investigate Growth modelling of the milk shark (Rhizoprionondon acutus Ruppel, 1837) from October 2019 until march 2021 for 18 months in northern waters of the Persian Gulf and the Oman Sea (Hormozgan Province). Overall, 317 shark samples of R. acutus including 137 males and 180 females were weighted. Results of the present work indicated that length-frequency distribution o...
Background As Western Australia’s (WA) Government enacts shark bite mitigation, the personal risk of shark bite in WA has not been studied. Aims Model the risk of large (>3m) white shark bite (Carcharodon carcharias, LWS) in southwest WA. Method Observational study, 1/1/1974 to 31/12/2013. Analysis of prey abundance, location, water temperature and water activity participation. Shark bite risk ...
There is increasing concern about the conservation status of sharks. However, the presence of numerous different (and potentially mutually exclusive) policies complicates management implementation and public understanding of the process. We distributed an online survey to members of the largest professional shark and ray research societies to assess member knowledge of and attitudes toward diff...
The basking shark Cetorhinus maximus is the world's second largest fish reaching lengths up to 12 m and weighing up to 4 tonnes. It inhabits warm-temperate to boreal waters circumglobally and has been the subject of fisheries exploitation for at least 200 years. There is current concern over its population levels as a consequence of directed harpoon and net fisheries that in the north-east Atla...
Parthenogenesis is a natural form of asexual reproduction in which embryos develop in the absence of fertilisation. Most commonly found in plants and invertebrate organisms, an increasing number of vertebrate species have recently been reported employing this reproductive strategy. Here we use DNA genotyping to report the first demonstration of an intra-individual switch from sexual to partheno...
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