Many of the common parasites to freshwater fish have complex life cycles involving more than one host, usually involving changes in life stage from one host to the next.
(Many of the common parasites to freshwater fish; have; complex life cycles involving more than one host,) (complex life cycles; involving; more than one host, usually involving changes in life stage from one host to the next) (more than one host; involving; changes in life stage from one host to the next; T:usually)
Many of the common parasites to freshwater fish complex life cycles more than one host
have involving involving
complex life cycles involving more than one host,
more than one host, usually involving changes in life stage from one host to the next
changes in life stage from one host to the next T:usually