Abstract: In a method for tagging members of a large group of macro-organisms so that each macro-organism is assigned to a respective subgroup, successive segments of wire are cut from a continuous length of wire. During implantation, a tag is ejected and stored to define the beginning of a set of successive tags corresponding to a subgroup of macro-organisms. The tags of that subgroup are then severed from the length of wire and implanted into respective members of the particular subgroup. Subsequently, another tag is severed from the wire and stored to mark the end of the subgroup. Upon capture of a member of a subgroup, the tag is excised, the respective multidigit code is read and compared with the multidigit codes of the stored tags to determine to which subgroup the captured macro-organism belongs.

Abstract: A fishing net includes a cord having a multiplicity of strands including an identification strand marked at spaced intervals with sequential numerical codes. The preselected strand is substantially inextricably incorporated in the cord so that the preselected strand extends along the length thereof. The cord is in turn incorporated in the net so that the cord extends substantially from one end of the net to an opposite thereof. The cord has ends located at readily accessible preselected points relative to the net so that a smallest numerical code and a largest numerical code on the cord are easily determinable upon visual inspection of the net.