are hydroids (from surface to bottom in decreasing numbers) ,°^ ' '"^ gooseneck 

 barnacles (from surface to 3 to 4000 ft) , mussels (only to about 30 miles 

 offshore and down to about 100 ft) , tunicates (in warm waters down to about 

 500 ft) , and bryozoans (surface to bottom increasing in numbers with depth) . 

 This decrease in quantity and species diversity has been encountered in 

 inshore waters. In the Gulf of Mexico, the biomass decreases from 4175 

 g/m2 at the surface to 84 g/m^ at the bottom (10 ft) within a few hundred 

 feet of the Louisiana shore. '^ Similar data have been obtained in the 

 Pacific and in the Atlantic. This relationship is quite dramatic in the 

 Tongue of the Ocean (off Bermuda) . Figure 6 shows that fouling was about 

 1000 g/m^ at the surface, and it declined gradually to by 800 to 900 

 ft. 74 



5 6 7 

 DEPTH (ft xlOO) 



10 11 12 



Figure 6 - Biofouling Mass as a Function of Depth 

 in the Tongue of the Ocean'^ 



28 



