Come identificare Common Whitefish

Per identificare Common Whitefish (Coregonus lavaretus), osserva queste caratteristiche chiave.

Caratteristiche fisiche

Forma del corpo

torpedo

Colorazione

Generally silvery, with a darker, often greenish-blue to brownish-grey back, fading to silvery flanks and a white belly. Fins are typically dusky or translucent. Coloration can vary significantly depending on habitat and specific population.

Tipo di squame

cycloid

Posizione della bocca

subterminal

Caratteristiche distintive

Adipose fin present (a small, fleshy fin between the dorsal and caudal fins, characteristic of salmonids)., Small, subterminal mouth, often with a slightly protruding snout., Large, cycloid scales., Forked caudal fin., Absence of teeth on the vomer (distinguishes from trout and salmon).

Pinna dorsale

Single dorsal fin, relatively tall, with 10-16 soft rays. An adipose fin is present posterior to the dorsal fin.

Pinna caudale

Deeply forked caudal fin.

Pinna pettorale

Paired pectoral fins, relatively small, positioned low on the body.

Pinne distintive

Pelvic fins are abdominal, positioned well behind the pectoral fins. Anal fin has 10-16 soft rays.

Consigli per l'identificazione

1. 1

   Adipose Fin

   Presence of a small, fleshy adipose fin between the dorsal and caudal fins is a key salmonid characteristic.

2. 2

   Mouth Position

   The mouth is typically small and subterminal (underslung), with the snout slightly overhanging the mouth. This distinguishes it from many trout and salmon species which have larger, terminal mouths.

3. 3

   Vomerine Teeth

   Absence of teeth on the vomer bone in the roof of the mouth is a critical diagnostic feature separating Coregonus from Salmo and Oncorhynchus.

4. 4

   Gill Rakers

   The number and morphology of gill rakers are highly variable within C. lavaretus and are often used by ichthyologists to distinguish different forms or populations. Generally, planktivorous forms have more numerous and longer gill rakers than benthic-feeding forms.

5. 5

   Body Shape

   A generally slender, torpedo-shaped body, silvery coloration, and deeply forked tail are characteristic.

Esplora Common Whitefish