fleuve - Discover fishes living in these biotopes

This fish breeds between May and June. During this period, the male has white wattles (pustules) on the it ad. The female lays enormous quantities of small eggs (100 to 300,000) that cling to the vegetation of the territory of the males. Spawning is noisy and causes splashes.

The skeleton of this sturgeon is made of cartilage. it barbs, on the front of it mouth, allow it to search for food in the sand. As it is the case for the larger species (beluga, Sevruga ...), its eggs are used for the production of caviar.

The European sturgeon is a migratory fish. The eggs are collected before they mature, they are used for the production of caviar. The sturgeon disappeared from many European rivers because of fishing and the construction of dams. For several years, it was raised in captivity in many countries.

This small fish detects alarm substances emitted by previous preys of a pike. This allows it to determine whether the predator is fasting or not. Breeding occurs from May to July. This species is frequently used as live bait to catch big fish (pike, perch).

Its diet depends on age: juveniles eat aquatic insects while adults feed on terrestrial and aerial insects. It is viviparous: the gestation lasts about 24 days. The female can give birth to about 30 fry.

Alosa fallax, also known as twait shad, is a shad species native to Europe. Adults live in the sea and migrate to estuaries only for reproduction. Found in the Eastern temperate Atlantic, they face challenges from dams, pollution, and coastal overfishing. Juveniles gather in estuaries and feed near the shore.

It easily accommodates to life in captivity, but it is aggressive toward smaller species. It breeds easily in aquarium: the male delineates a territory in which the female lays its eggs. After hatching, the pair will protect juveniles against potential predators.

The European eel, A. anguilla, is a freshwater fish native to Europe. Abundant until the 1980s, it has been severely affected by overfishing. It is considered a critically endangered species in France and several neighboring countries.

The tete sea catfish is listed from Mexico to Peru in the coastal waters of the Pacific coast. It is characterized by large eyes useful for hunting its prey (crustaceans, fish) and escaping from its predators. These territorial fish are among the few species of catfish adapted to marine life.

In captivity, it is best to keep it in a group of at least 5 people. It rarely breeds in aquariums, It is why we take significant amounts from the wild to supply the aquarium trade.

It owes its name of "freshwater shark" only to the shape of its dorsal fin. It behavior and it food have nothing comparable. It acclimates easily to the aquarium.

Small barbs located around its mouth enable it to detect food. It is easy to breed in captivity. The species is very prolific, nests often have over 500 juveniles.

It sometimes lives in brackish water. It easily accommodates to life in aquariums, but unfortunately its captive breeding is still impossible.

Carcharhinus falciformis, known as the silky shark, is widely distributed in tropical and subtropical seas. However, this species is threatened due to overfishing, and is classified as vulnerable by the IUCN. Recognizable by its elongated and slender body, gray back, and white belly, this fast and aggressive predator feeds on fish, mollusks, and crustaceans.

The bull shark is listed in most tropical and subtropical seas. It is feared due to its propensity to attack humans, being responsible for most recorded fatal attacks to date. This active predator primarily hunts in murky waters. It is capable of swimming long distances and adapts to changes in salinity, frequenting estuaries, coves along the coasts, and waters with high turbidity.