LINDALL, HALL, and SALOMAN: CONDITIONS OF UPLAND CANALS 



Table 2. — Monthly occurrence and number of individuals of vertebrates and invertebrates collected with otter 

 trawl at all stations from August 1970 through August 1971. No individual collected in July and August 1971. 



1 Of commercial or sport value. 

 " Demersal or bottom feeder. 



and made up nearly 4% of the total number of 

 animals collected during the year. 



The first trawl sample was made in August 

 1970, 2 months after bay water was introduced 

 in the canal system. At that time the only spe- 

 cies of fish found in the canals was the bay an- 

 chovy, and 98% of the specimens were taken at 

 Station 4 (Figure 3; Tables 3, 4, 5, 6) . By Sep- 

 tember, the blue crab, pink shrimp, brief squid, 

 and four additional species of finfish were caught 

 within the canal system. Station 4 contained 

 seven species of vertebrates and invertebrates 

 while Stations 2 and 3 contained five species 

 each. No specimens were yet found at Station 1. 



In October, 5 months after water was introduced, 

 fishes and invertebrates were found in all canals, 

 and a total of 15 species were collected. Station 

 4, with 11 species, still contained the greatest 

 faunal diversity. Stations 1, 2, and 3 contained 

 10, 5, and 4 species, respectively. 



Through the winter, spring, and early summer 

 months (November through June) an average 

 of 16 species per month was collected throughout 

 the area. The number of species and individuals 

 at each station declined in April and May cor- 

 responding to reduction in dissolved oxygen, but 

 in June the number of species and individuals 

 increased again at all stations. 



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