I'm feeling lazy so I'll direct you to an article..."Lampreys are native and good for the river and ecosystem."
Enlighten please....
....lee s.
http://crosscut.com/2012/03/the-lamprey-close-extinction-could-bring-down-nw-s/
and to add a tad...
The pacific lamprey, as an anadromous fish, is an indicator species meaning that it flags the health of the ecosystem on the whole and especially of other anadromous fish which share the same watersheds (sturgeon, striped bass, shad, salmon and steelhead).
Also, because of their larval stage (in the river) whereby they are filter feeders (rather than parasites as in their adult form...) they are indicators of water quality as filter-feeding animals are far more subject to river; pollution, toxicity, ph imbalances, etc... and when such conditions threaten their survival, you can be assured that many other vertbrate and invertebrate, aquatic and terrestrial critters inhabiting the river are also affected.
It can even be argued that the parasitic adults, which latch on to and suck the blood out of individual fish, are actually helping the species of said fish by predatory-induced natural selection. Since the weak, sick, mutated, or otherwise less capable members of fish populations are most often targeted and killed/eaten by predation; it ensures that the stronger, healthier, genetically superior and otherwise more capable fish survive to propagate and produce better offspring...
I could go on but I think that's enough~
Bookmarks