Becker, George C. / Fishes of Wisconsin
Glossary, pp. 51-59 ff. PDF (3.1 MB)
Glossary abdominal-pertaining to the belly; the pelvic fins are abdominal when they are inserted far behind the bases of the pectoral fins. acute-sharply pointed; an angle less than 900. adipose fin-the fleshy rayless fin on the midline of the back between the dorsal and caudal fins, as in the trouts and bullhead catfishes. age-age (growth) is determined by counting the annuli or growth rings depos- ited on scales, spines, or vertebrae. Age is expressed in arabic numerals (e.g., 1, 2, 3, etc.) or roman numerals (e.g., I, II, III, etc); 0 is young-of- year. The arabic numerals express the yearly lengths of each fish as deter- mined by back calculating to each annulus (since the growth of the scales, spine, or vertebrae is essentially proportional to the linear growth of the fish). The roman numerals generally have been used to express the lengths of each age class as determined by the actual field lengths of the fish of that age class at the time of capture. air bladder-see swim bladder. alevin-the newly hatched, incompletely developed fish (usually salmonid) still in the nest or inactive on the bottom and living off stored yolk. ammocoete-the burrowing, larval stage of the lamprey. anal fin-the unpaired fin behind the vent. anal fin height-the distance from the origin of the fin to the tip of its anterior lobe. 51
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