Biology Reference
In-Depth Information
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Figure 5.3 Metamorphosis of the summer flounder Paralichthys dentatus. (A) Hatched
yolk-sac larva. (B) Pretransformation larva before eye migration commences. (C) Early
metamorphosis and the beginning of eye migration. (D) Mid-metamorphosis. (E) Meta-
morphic climax, right eye has migrated over the dorsal midline. (F) Young juvenile. Left
column in B
D shows the migration of the eye across the skull; migrating right eye is
shaded in gray. Rightmost column shows whole-body morphological changes at each
stage. Images reprinted with permission from (
Martinez & Bolker, 2003
)
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2.2. Diadromous teleosts
Diadromous species migrate between salt water and fresh water environments;
metamorphosiscanpreparethesefishtosurviveintheirnewhabitat.Thephys-
ical demands of amarine environment differ significantly from those of freshwa-
ter, and diadromous teleosts undergo substantial changes in morphology. These
include changes in body shape, muscle, skin, and pigmentation; changes in the
structure and function of numerous organs, including the kidneys, gut, eyes, and
lateral line; and physiological changes in osmoregulation and metabolism.
