Gasterosteus aculeatus (Three -thoroughbred Epinoche)

Gasterosteus aculeatus is a fish commonly known as "mule" or "backbone mule". It is from cold waters of the North Atlantic and is often found in estuaries, rivers and coastal lakes. The mule is small, generally 5 to 8 centimeters long, although it can reach up to 12 centimeters in certain regions. Its color generally varies from silver gray to brown, with darker spots on the back and sides.

The mule is characterized by a dorsal thorn that stands on the back, as well as by very hard scales that cover its body. This dorsal thorn and these scales give it a thorny appearance, which allows it to defend itself against the predators. The mule is also equipped with well -developed ventral and pectoral fins, which allow it to quickly move into the water.

The mule is an omnivorous fish that feeds mainly on small invertebrates, such as crustaceans and molluscs, as well as algae and plants. He was also observed in the process of feeding on small fish, like the fry. The mule is generally reproduced in spring and summer, by grouping in large benches to make. The female lays her eggs in protected places, such as rocks or algae, where they can be protected from predators. Eggs generally hatch in a few days, and fry are independent from birth.

The mule is a relatively common fish in many coastal regions, and it is often caught for human consumption. Although its flesh is considered delicious by many, the mule is also considered a sporting fish by fishermen, due to its fighting spirit when it is taken at the end of the line.