3) The high yield per square meter results from: 



a. high primary production (500 gm dry wt/m^, which is about two 

 times the North Sea) and 



b. short, efficient food chains. 



4) Construction of the simplest food chains consistent with the available 

 data indicate that the yield populations require 20-40 percent of 

 total primary production for their support. 



5) A high proportion of primary production is utilized directly as detritus 

 particles with little loss of energy through intermediate microbial 

 steps . 



6) The most important information gaps which limit our understanding of 

 the system are: 



a. cost of producing forage food fish and 



b. percentage of energy lost in detrital decomposition. 



176 



