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Critical habitat, movement, and spawning behaviour of Silver Shiner (Notropis photogenis) in the Grand River, Ontario

This project was made possible with assistance from the OMNR SARSF Fund


 

Abstract: Silver Shiners (Notropis photogenis) were captured and habitat was characterized from 38 locations in the Grand River during the summer and autumn of 2013 to 2015. Cobble was the most frequently used substrate type (44.6 % of observations), and diet consisted of 90 % aquatic and terrestrial insects. Length-weight regression was W = 1E-05 x L2.9107 (r2 = 0.97, n = 390) and population size structure and qualitative growth patterns suggested rapid growth during the first 2 years after hatching (n = 439). The largest fish captured was 143 mm TL, which is a new Canadian record and tied the world record from Tennessee. Spawning was not directly observed but gamete evidence suggested it took place from early to mid June when the water temperature was approximately 24 C. Silver Shiners moved upstream during late afternoon and evening in October/November to overwintering areas. During this time schools of Silver Shiners were also observed downstream and upstream from a low-head weir indicating that successful use of the fishways at this site may have been possible.  Silver Shiners were located near known sources of groundwater seepage during 92.1 % of observations, suggesting that groundwater may represent critical habitat that facilitates persistence of Silver Shiner populations in Canada.

 

 

 
Silver Shiners - Grand River 2009

Fall Silver Shiner migration to over-wintering habitat - Grand River, Ontario
 


BRAVO Underwater Video November 7 2009

 

   
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