I was wondering, what is a salp exactly? It seems rare, I think it is the only category I haven't spotted any so far, and none of the images with a salp-comment has a salp.
Some categories are much less abundant than other in the water we sampled. Salps are some of those. But in other area/time their poulations can explode
salps are planktonic Tunicates. Check out this video it much better than I can explain it to you http://www.planktonchronicles.org/en/episode/salps-exploding-populations
by
cnorvalk