![]() Unlike the viviparous method, the female doesn’t provide food to her offspring directly, but they feed on the eggs of the yolk sac and the fluids from the walls of the womb. On this way, the eggs hatch inside the female’s womb, in the oviduct. The most frequent of the reproduction methods among sharks. Shark – This is how a female lemon shark gives birth to her young. This is the main reason why the shark cannot be a mammal. Sharks don’t have mammary glands, which means that the young must search for their own food after leaving their mother’s womb. The biggest difference is that, once the moment of birth has arrived, the young is independent of its mother. The substances that feed the embryo come directly to the mother, through an umbilical cord. Females give birth to fully developed and alive young. This is the method of reproduction for sharks that most closely resembles that used by mammals. Incredible image of translucent shark egg. Oviparous shark species are, for example, Zebra shark, catsharks, swellsharks or the Hornshark. The embryos continue the development process inside the eggs, feeding on the yolk. After mating, the female lays her eggs in safe areas as rocks or algae. Sharks can be:Ībout 30% of shark species are oviparous. It is at the time of gestation when the differences between the different species arise. The males have an organ called the pterygopod, which serves to fertilize the female. As we said, about 500 different species of shark have been discovered.ĭespite the existence of so many species, they all have one thing in common with respect to reproduction: fertilization is carried out internally. Shark reproduction methods vary depending on the species in question. One of these characteristics that makes them so special is the ways they can reproduce. Sharks are fascinating creatures, with a lot of peculiarties. Is the reproduction of sharks similar to that of mammals? ![]() Although the confusion was caused by the fact that cetaceans have fins and live underwater, they were considered mammals and expelled from the category of fish.īut what happens in the case of sharks? Aren’t there sharks that can give birth? Are there differences between a shark and a mammal like cetaceans? With the evolution in science and the expansion of knowledge, we began to make distinctions between marine species. The great lack of awareness of the ocean in the past caused that, generally, all aquatic creatures were classified as fish. This confusion has also occurred with cetaceans, such as dolphins or whales. This last point is essential, since the term “mammal” comes from “mammary glands”. ![]() In addition, they have mammary glands with which they will feed the young during the first stage of their lives. One of the main characteristics of mammals is that they give birth to their young. To achieve this we are going to present the different characteristics of this peculiar species. In WeFish, we are going to solve this question that has intrigued humanity since time immemorial. There is also a neutral position that ensures that it is neither one thing nor the other. Despite the great antiquity of the shark species, one of the most questioned issues regarding the sea is still debated: Is shark a mammal or is it a fish? Currently there are many defenders of the two positions. Almost half a thousand different shark species have been known. It is estimated that the first shark species appeared on the planet 400 million years ago and they have been diversifying ever since.
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