Eight subisotypes belonging to 4 IgL isotypes (IgLκF, IgLκG, IgLσ, and IgLλ) were identified from rainbow trout.
The genomic organizations of trout IgL isotypes were characterized.
Trout IgL isotypes participated in immune responses to stimulants.
Trout IgLκG and IgLσ isotypes preferentially bonded with the heavy chains of IgM and IgT, respectively.