Bitterling is a small fish belonging to the carp family, reaching up to 9 cm of total length. Its body is flattened laterally and covered with cycloid scales (Photo. 1). Along the axis of the body, there are up to 40 scales. The lateral line passes through only 5-6 scales. During breeding season, bitterlings exhibit sexual dimorphism –…
Body of weatherfish is elongated and slightly flattened laterally (Photo 1). Scales are embedded in the skin. The species has a small head with small mouth. It has five pairs of barbells around the fleshy lips. Small eye are situated at the top of the head. Pigmentation of the body depends on the surrounding environment, can be fro…
Twaite is an anadromous fish belonging to the Clupeidae family. It reaches total length of 55 cm and weights up to 1.5 kg. Usually, it is 40-45 cm long and weighs 1 kg. Its body is fusiform, laterally flattened with colours typical of pelagic fish. The back is green-blue while the rest of the body is light silver. A characteristic featur…
River lamprey is a species belonging to the lampreys family Petromyzontidae. It has a cylindrical, elongated body with laterally flattened caudal part and a small conical head with a disc-shaped sucker (Photo 1). River lamprey has a third eye situated near the nostril. Two dorsal fins relocate closer to each other during breeding…
Sea lamprey is a jawless fish (Agnata) from the northern lamprey family (Petromyzontidae). It has a very specific body shape. Sea lamprey has an elongated, eel-like body with its head possessing a mouth disc with the diameter larger than the cross-section of its gills section. Numerous tooth hooks are located in rows on the disc. On…
Small fish belonging to order Cypriniformes. The body is elongated and flattened laterally, and has a bright shade of creamy yellow colour with numerous dark brown spots on the sides and back, which are arranged in four distinct stripes (Gambetta 1934, Nalbant 1933) (Photo 1.). Head constitutes on average 19% of the entire length of the…
Sabrefish is a semi migratory fish which belongs to cyprinid family. It reaches total length of 50 cm and weights up of 1 kg. Usually, it is 35 cm long and weighs 400 g. Its body is laterally flattened, elongated with horizontal back line (Photo 1). The edge of the ventral side is arched and flattened forming a distinctive “sharp” keel…
Asp is a fish belonging to the cyprinid family. It can reach over one meter length and weigh up to several kilograms. Its body is elongated, slightly flattened at the sides, covered with cycloid scales (photo. 1.). This species has a big head with mouth reaching up behind the right corner of the eye. Dorsal and tail fins are grey and blue with d…
