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Definitions - J

Jawfish	any species in the Family Opisthognathidae; these marine fish have large mouths and typically burrow into the substrate; the most commonly seen aquaium species is Opisthognathus aurifrons, fromt ehtropical Atlantic and Caribbean

Jawless fish	any of the Class Agnatha, primative forms such as lampreys and hagfish; seldom exhibited in aquariums

Jellyfish	a sea jelly, or schyphozoan cnidarian

Julidochromis	cichlids of Lake Tanganyika, Africa, many species of which are popular with hobbists