The 1990 National Shellfish Register 



Figure 2. Commercial Shellfish Landings for Selected Species, 1985-1989 



a small contribution of coliform 

 bacteria. In the case of some 

 sources, additional shellfishing areas 

 may be classified as buffer or safety 

 zones, anticipating plant closures or 

 bypasses, and in response to sea- 

 sonal increases in boating activity. 

 Table 5 shows the acres and percent 

 of harvest-limited acreage in each 

 region adversely affected by 14 

 pollution source categories. The 

 acreage and percent of harvest-limited 



acreage in each estuary affected by 

 each pollution source category is 

 shown in Appendix D. 



The effect of coastal development on 

 shellfish-growing areas can be seen 

 by the increasing acreage adversely 

 affected by development-related 

 pollution sources from 1985 to 1990. 

 For example, the largest increases are 

 attributed to urban runoff, increasing 

 from 23 to 38 percent of harvest- 



8 



