Articles about aquarium fish
Bloodsucking catfishes: What we know about them? The mankind has stepped into the 21st century, but still little is known about the so-called blood-sucking som. There are many stories of…

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Water change in the aquarium
Many novice heard this expression. We will understand what it is and whether it is at all. The aquarium is a fully closed system in which everything must be in…

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CARE FOR AQUARIUM FISH - My files - file Catalog
Before you have a particular aquarium fish, not be amiss to ask, what conditions are considered optimal for the species: temperature, hardness and acidity of water, the requirements for lighting,…

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Sharks

Sharks are color blind

At the University of Queensland examined the eyes of the shark and came to the conclusion that those deprived of color vision.

The research object of scientists were 17 species of sharks. During microspectrophotometric analysis, it was found that 10 of them were no cones, intended for color vision, and their role was partially assumed the highly sensitive sticks. The remaining seven species that belong to three different families, had one type of sensing elements designed to detect wavelengths from 532 to 561 nm.

It is known that whales, dolphins and killer whales also stick with the cones of one type, which is able to recognize green color.

With regard to the research results, here we can conclude that, apparently, for the sharks plays a major role contrast, which allocates a single object on a background of another, — says biologist Nathan Scott HART.

The information obtained will be used for development of equipment for divers and surfers.

Popularity: 5%

Added to category: Fauna

Sharks scare off patrols of dolphins and orcas

Scientists from Australia, South Africa, Japan and New Zealand are working to establish patrols of dolphins and orcas that can protect coastal areas from shark.

The idea to organize dolphins, sort of, marine coastal patrols appeared biologists on the basis of a very common phenomenon, when these marine mammals protect the troubled people from predatory marine fish.

In particular, one of the most famous cases of recent years was the story that happened off the coast of New Zealand, where a group of 4 divers for no apparent reason surrounded by a dense ring of dolphins. Thus animals persistently thwarted any attempts of people to escape from a cordon. When one of the divers still managed to leave the circle, he saw that around the great white shark. As a result the dolphins escorted the people to a safe shallow water.

At the moment one of the main problems that scientists are trying to solve is to find a way to “bind” the dolphins to a certain area, as in ordinary life, they moved in search of the best places for reproduction.

Popularity: 4%

Added to category: Fauna

Female sharks can reproduce without the participation of males

Reproduction in nature is female, no male is known as parthenogenesis. While the adult organism develops from an egg that was not fertilized. This phenomenon is quite rare, and scientists were able to trace only about 70 species of vertebrates, including fish, lizards and birds.

To closely examine this phenomenon of sharks scientists have pushed the case in the aquarium Belle Isle in Detroit, where in 2001 the female bamboo sharks, which never met with males, there was a baby. Was an isolated case, so to confirm this ability of sharks took another few years of research.

During his scientific work, biologists have managed to grow from two eggs to two healthy cubs bamboo sharks, the observation of which lasted for five years. According to scientists, the structure and evolution of no abnormalities in individuals born from unfertilized eggs, compared with sharks, which appeared when the participation of males, no.

Popularity: 4%

Articles about aquarium fish
Bloodsucking catfishes: What we know about them? The mankind has stepped into the 21st century, but still little is known about the so-called blood-sucking som. There are many stories of…

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The most terrible inhabitants of sea depths
1. Angler / Angler Fish / monkfish / monkfish / Angler Fish This deepwater monster could easily become a nightmare of every diver and is considered the most ugly fish…

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