Table 1 Morphological characteristics of the seaward-migrating juvenile trout classified as parr, pre-smolt and smolt (after Tanguy24).
From: The influence of initial developmental status on the life-history of sea trout (Salmo trutta)
Morphological characteristics | |
|---|---|
Parr | Light to yellowish body coloration, no silvering of scales, red spots, yellow to brownish-orange fin color, and parr marks are clearly present. |
Pre-smolt | Parr marks almost completely obscured by the silvery appearance of the scales, receding red spots, and fish are relatively thinner in appearance than parr. |
Smolt | Absence of parr marks, almost fully silvering of scales, no red spots, darkened fins, and fish are slender in appearance than parr and pre-smolts. The head is more pointed. |
