Humans, birds and fish can all be affected by PSP toxins. Herbivorous zooplankton is the primary transvector which can in turn transmit the toxin to fish and possibly other marine creatures which consume zooplankton (Baden 1983). The usual route for humans is the consumption of raw or cooked contaminated shellfish.
The definition of obstinate is extremely stubborn and determined to have your own way. An example of obstinate is a person who drives during a severe hurricane despite major warnings not to do so. obstinate. not easily subdued, ended, etc. obstinate.
adjective. 1  Refusing to give up or let go; persevering obstinately. 2  Insistently repetitive or continuous: a persistent honking of car horns. 3  Existing or remaining in the same state for an indefinitely long time; enduring: persistent rumors; a persistent infection. Botany Lasting past maturity without falling off, as the calyx on an eggplant or the scales of a pine cone. Zoology Retained permanently, rather than disappearing in an early stage of development: the persistent gills of fishes.