Tests of Some Batch‐Marking Techniques for Rainbow Trout(Salmo gairdneriRichardson)

摘要

ABSTRACTFreeze‐branding and tattooing by Panjet were used as techniques for rapid application of batch marks to rainbow trout of stockable size. The subsequent performances of the marks produced were compared. Freeze brands took 2 weeks to become clear and thereafter remained wholly satisfactory for only 1 month. Pigments injected by Panjet were immediately visible but of the dyes tested only Alcian blue remained completely clear after a 3‐month trial. These results are contrasted with those of other workers in trials with various species of freshwater f