Croissance en longueur et en poids des barbottes brunes Ictalurus nebulosus (Le Sueur) capturées à la frayère de la rivière aux Pins, près de Montréal (Québec)

Abstract

Seine and dip net samples taken on the spawning grounds in Rivière aux Pins were used to describe the growth of young-of-the-year brown bullhead (Ictalurus nebulosus Le Sueur). One-year-old and older bullheads were aged by counts of annual growth marks on sections of their pectoral fin bony ray. Several aspects of the growth of these fish were determined: a faster growth in length and weight in ma les than in females; the presence in Rivière aux Pins of two groups of bullhead, one more slowly growing and one more rapidly growing; the effects of tagging on growth; the isometric length–weight relationship; and variations of condition during the few months when spawners occupy Rivière aux Pins.