There is little evidence of improve

There is little evidence of improvement in N retention by P. monodon in pond system over the last few year: Briggs and Funge-Smith (1994) in a study of N budgets in shrimp ponds in the early 1990s found a similar percentage N retained by P. monodon to a study by Preston et al. (2000) in the late 1990s (21% and 22% respectively)