“…Generally, the IgLk isotype is more abundant in teleost than the IgLs and l isotypes. The teleost IgL1, IgL2, and IgL3 have been identified in rainbow trout Oncorhynchus mykiss [3,4,16], Atlantic salmon Salmo salar [17], spotted wolfish Anarhicas minor [18,19], green pufferfish Tetraodon nigroviridis [20], common carp Cyprinus carpio [21,22,23], and zebrafish Danio reio [24,25]. From an evolutionary point it is favorable having more than one isotype or light chain locus so that IgLs can successfully rearrange to contribute to the variability of immunoglobulins.…”