Kako prepoznati Sturgeon

Za prepoznavanje Sturgeon (Acipenser) bodite pozorni na te ključne značilnosti.

Fizične značilnosti

Oblika telesa

elongated

Obarvanost

Dorsal coloration typically ranges from dark grey, olive-brown, or black, fading to lighter grey or white on the ventral side. Some species may have mottled patterns.

Vrsta lusk

none

Položaj ust

inferior

Razpoznavne značilnosti

Five longitudinal rows of bony scutes (dorsal, two lateral, two ventral) instead of scales., Four barbels located anterior to the mouth, used for foraging., Protrusible, toothless mouth located ventrally., Heterocercal caudal fin (upper lobe longer than lower lobe)., Cartilaginous skeleton (partially ossified in some areas).

Hrbtna plavut

Single dorsal fin, located far back on the body, typically with 30-50 soft rays.

Repna plavut

Heterocercal caudal fin, deeply forked, with the upper lobe significantly longer and containing the vertebral column.

Prsna plavut

Paired pectoral fins, relatively large and triangular.

Razpoznavne plavuti

Pelvic fins are abdominal. All fins are supported by cartilaginous rays.

Nasveti za prepoznavanje

1. 1

   Scutes

   Count the number and arrangement of the five rows of bony scutes. The number of scutes within each row can be a key differentiator between species.

2. 2

   Barbels

   Examine the position, length, and fimbriation (fringing) of the four barbels located in front of the mouth. For example, in some species, barbels are closer to the snout, while in others, they are closer to the mouth.

3. 3

   Snout Shape

   Observe the shape and length of the snout, which can be pointed, rounded, or shovel-like, varying significantly among species.

4. 4

   Mouth Size and Shape

   Note the size and shape of the protrusible mouth, as well as the presence or absence of a median labial cleft.

5. 5

   Body Coloration

   While variable, general dorsal and ventral coloration patterns can aid in identification, especially when combined with other features.

Raziščite Sturgeon