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A new device could help prevent the accidental fishing of sharks, whose population is drastically declining. The device consists of an electric transmitter that keeps sharks at a distance while fishing.
A team of scientists used a helicopter and a drone to capture the first aerial images of killer whales hunting and killing great white sharks in South Africa. A promising technology.
Over millions of years, sharks have undergone numerous adaptations in the face of climatic and geological change.Far from being frozen in time, sharks have undergone great diversification (in terms of species) right up to the present day.
European citizens' initiative to ban trade in shark fins shark has been a resounding success. This is only the eighth European citizens' initiative to pass the million-signature mark.
Nearly two-thirds (59%) of the 134 species of reef sharks and rays are threatened with extinction. This study highlights the urgent need for sustainable fisheries management and the importance of marine protected areas.
Some shark species are geographically isolated and specifically differentiated. This makes certain populations more vulnerable to certain diseases. Case study: lemon sharkslemons.
A group of researchers has produced some twenty chemical solutions capable of replacing squalene in the manufacture of certain vaccines. A fine prospect for relieving shark populations.
Shark reproduction is much less efficient than that of bony fish. This evolutionary handicap, combined with overfishing, is a major threat to shark populations.
Marine protected areas, when they are truly protected, provide habitats for certain vulnerable animals. Here in Mozambique, for example, certain species of shark are benefiting from this and consolidating their numbers.
Scientists are wondering what will happen to the "intermediate" predatory fish in the middle of the food chain as sharks gradually disappear. The protocol described in this article attempts to predict their future.
In sharks, jaw evolution is correlated with habitat, size, diet, trophic level and taxonomy. By knowing these parameters, evolution can be predicted and the preservation of these animals facilitated.these animals.
Hammerhead sharks are said to be able to hold their breath. Whether this is intentional or not remains to be seen, but it gives them the advantage of being able to conserve more heat when hunting at depth.
To improve their chances of spotting tiger sharks, some diving clubs use nutritious bait. As part of the development of ecotourism, this practice is being studied by scientists for its impact on sharks.
During the last mass extinction 66 million years ago, 62% of ray and shark species became extinct. The diet and geographical distribution of the different groups determined their disappearance.
To protect elasmobranchs, scientists are developing mathematical models to assess the spatio-temporal dynamics of species. This article proposes the integration of data to improve model reliability.
"The bulldog sleeper shark shows genetic divergence as a function of island formation and historical sea level. A speciation process that has long remained unknown. "
Determining the isotope ratios of teeth from a population of Bull shark population as a function of developmental stage and sex has shown that adult females feed mainly on animals at the top of the food web.
A healthy population of great white sharks in South Africa has all but disappeared following increased predation by killer whales.
Observing sharks during tourist activities gives these animals an "economic value" and helps states protect them from over-fishing. But these activities can have adverse effects on their behavior and survival.
A major study has investigated the genetic, biological, dietary, geographical and behavioral factors that determine the success of juvenile sharks.pointe-noire. The aim is to protect shark species, which are under serious threat.
Great white shark populations in South Africa are stable, yet sightings are becoming increasingly rare. The reason is undoubtedly the presence of an even more formidable predatorthe killer whale.
Despite the positive aspect of shark mediation, the pressure of "ecotourism"could have serious consequences for these animals. Their behavior and energy expenditure seem to be disrupted by excessive human presence.
Some coastal sharks enter estuaries seasonally, depending on temperature and availability of food resources. Changes in these parameters are leading to a worrying overlap in shark ecological niches.
Sharks are a slow-evolving lineage with exceptionally low cancer rates. These two characteristics could be explained by a low nuclear mutation rate. This seems to be the case for the shark sculpin shark.
This study highlights the vulnerability of the functional diversity (variety of responses that species in an ecosystem make to change) of rays and sharks, and reveals the importance of these animals for functional biodiversity.
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