What movie is this ? (alien/parasite/scifi ?)?

I really wanna see it again but it was such a long time ago all i can remember is some professor showing a glass a fish tank full of weird alien looking things and one bite him and then near the ending some monster chasing this kid asking don't u want me or something something about mating it was weird but i remember it was a good movie and i think parasites or parasitic aliens had something to do with it it's scifi that's all i know for sure :/
also don't you hate it when this happens D8< sorta remember an awesome movie but can't remember the name of it
also i know it was old i saw it in either the late 90's or the early 2000's on vhs or tv i think
and it was colored >_>
 
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