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Reproduction and recruitment of gizzard shad in kansas reservoirs usa



Reproduction and recruitment of gizzard shad in kansas reservoirs usa



North American Journal of Fisheries Management 7(1): 71-80



Gizzard shad (Dorosoma cepedianum) were collected from 19 Kansas reservoirs to evaluate reproduction and recruitment. Reproduction occurs yearly in large reservoirs (500-6,000 hectares) in Kansas, regardless of adult population structure, but survival to adulthood is sporadic. Gizzard shad ovaries were collected near the peak of the 1983 spawn from Melvern Reservoir, one of the 19 impoundments. Egg-diameter measurements from these ovaries had discrete modes, indicative of multiple-spawning capabilities. However, the gonadosomatic index (GSI)and trawling period extended from early May to mid-June. Statewide, proportional stock density (PSD) and mean relative weight (Wr) of adult gizzard shad the previous fall had significant influences on the shad indicated that the younger females contained mostly eggs of one size, while smaller females contained eggs of two sizes. Thus, populations dominated by small adults (180-279 nm) produced a broader size range of young-or-the-year fish.

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