MONTANA RIVERS INFORMATION SYSTEM 

 Rivers Report 



APPENDIX B (cont.) 



Fish Species Database Structure •■ FISHSPEC.DBF 



Dec Field Description 



HABIT VAL 



GENE VAL 



Unique three-digit number describing a fishery 

 watercode and section; is also found in FISH.DBF 

 Species name (see below for the list of fish species 

 found in Montana) 

 Abundance of the species (A-Z) 

 A = Abundant, B = Abundant with proportional 

 number of large-size fish, C = Common, D = 

 Common with proportional number of large-size fish, 

 U = Uncommon, V = Uncommon with proportional 

 number of large-size fish, R = Rare, E = Presence 

 not verified but expected, I = immature fish only, N 

 = not present, P = Species not present but could be 

 present if introduced, Z = Abundance unknown 

 Habitat rating (A-D) 



A = Best, B = Substantial, C = Moderate, D = 

 Limited 



Genetic rating (A-I) (see guidelines for further 

 explanation, pg. 11) 



A = isolated genetically pure population, B = 

 potentially pure population with no record of 

 contaminating species in spawning areas, C = 

 potentially pure population where no contaminating . 

 species exist, but records show contaminating species 

 have been planted, D = especially valuable genetically 

 pure cutthroat or bull trout population with 

 contaminating species in the reach or drainage, E = 

 potentially pure population where contaminating 

 species are known to exist, G = genetically pure 

 population, H = hybridized or introgressed population 

 known to exist, I = genetically pure px^pulation where 

 contaminating species could invade 



B - 3 



