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[]|975 



Figure 4. — Abundance of A) Micropogonias undulatus and B) Anchoa milchilli by slalion and season for (he North and South Sanlee Rivers. 

 Ratios over bars indicate number of collections where fishes were captured to total number of collections at a station. 



Hardy (1967) found sexually mature individuals at 2.5 mo of age 

 in the Chesapeake Bay system. 



Ictalurus catus, white catfish. — The distribution of /. catus 

 was obviously influenced by salinity since catches declined 

 markedly at higher salinity stations (Fig. 5A). In the North 

 Santee River, catches of /. catus were greatest during all seasons 

 at stations furthest upriver. Distributional patterns in the South 

 Santee River were similar in that /. catus seldom occurred at 

 higher salinity stations. Shealy et al. (1974) found no /. catus at 

 estuary mouths of the North and South Edisto or Charleston 



Harbor-Cooper Rivers. The infrequent occurrence of white cat- 

 fish at the mouth of the Santee River probably reflects the often 

 low-salinity nature of the Santee River and the subsequent 

 penetration by lower salinity species. High biomass of /. catus 

 corresponded with peak numerical abundance in both rivers. 

 Length-frequency distributions (not shown) showed that most 

 white catfish collected in the Santee system were < 100 mm, 

 although the length range extended from 10 to 370 mm. Based 

 on an age-growth study of /. catus from South Carolina 

 (Stevens 1959), the fishes < 100 mm are not older than 2 yr. In 

 the North Santee River, young-of-the-year fish (<50 mm) were 



