![]() Interestingly, these sharks have one of the fastest rates of growth among all shark species. The mother shark leaves the juveniles soon after they are released from its body. The baby blue sharks do not get any parental care after they are born. A single litter can contain anything between 4 and 130 pups, with the average range being 25 to 50. The gestation period of the female is 9 to 12 months, while the young ones are hatched inside their mother’s body, after which the female gives birth to live young. The female migrates northward for delivering the offspring, though it is not yet known how frequently the females give birth, or how long the sperm is stored inside the oviduct. ![]() When the mating is done, both sharks part ways and never join again. This act delivers the sperm for the fertilization of the eggs. If the latter accepts the courtship, the former would insert its clasper inside the oviduct of the female. Before mating, the male blue shark would induce a bite between the first and the second dorsal fin of the female. These creatures are polygamous and reproduce through viviparity after they attain the age of sexual maturity when they are around 5 to 6 years old. Various fishes like haddock, pollock, flounders, mackerel, herring, sea raven, silver hake, white hake, red hake, butterfish, and cod are also common.īlue Shark Teeth Reproduction & Life Cycle Their diet includes squids, octopuses, lobsters, crabs, small sharks, and occasionally seabirds. They are carnivorous, opportunistic predators feeding on about 24 species of cephalopods and 16 species of fish. They are curious and fancy approaching the shores and are often seen by divers and boats. However, all-male or all-female groups have also been seen. There is also clear evidence of hierarchy in a group that is usually determined by size, sex, etc. The sharks are social in nature and move in small to medium size schools. ![]() They have also been reported to perform acrobatics out of the water surface while chasing prey. No other data about communication is available. They communicate with each other through movement gestures or body language. In such cases, the blue shark can prove to be one of the fastest-moving fish. In general, these sharks are lethargic and slow swimmers, and would only increase their moving speed when they get stimulated by other factors including views of other underwater animals that can be their prey. ![]() The ISRA Criteria have been designed to capture important aspects of shark biology, ecology and population structure and to encompass multiple aspects of species vulnerability, distribution, abundance, and key life cycle activities, as well as areas of high diversity.Blue sharks are nomadic animals that can migrate over long distances in search of food or for mating. The definition of these ISRA Criteria has been of fundamental importance for the effectiveness of the tool in terms of its application, standardization and consistency across identified sites, as well as comparability between ISRAs at national, regional, and international scales. The identification of ISRAs is achieved through the application of scientifically based criteria. The ISRAs’ main purpose is to attract the attention of policy- and decision-makers on the need of maintaining the favourable conservation status of sharks in that specific area through the implementation of the most appropriate management measures, and this can include an MPA designation. Conversely, ISRAs are only identified based on scientific criteria that describe their importance for the survival and well-being of one or more shark species found there. Protected areas are delimited spaces where specific regulations are enforced to ensure that human behaviour is controlled so that the negative effects of such behaviour on the conservation of the target species can be avoided or mitigated. Any relevant management implication can only be subsequent to, and detached from, the ISRA identification process. This makes the ISRA identification process completely independent from political pressure. The identification of ISRAs is an evidence-driven, purely biocentric process based on the application of ad hoc scientific criteria supported by the best available science. ISRAs are “discrete, three-dimensional portions of habitat, important for one or more shark species, that are delineated and have the potential to be managed for conservation”. ![]()
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