Bluefin tuna are not egg-laying fish, they are live-bearing fish which means that they give birth to live young. When bluefin tuna reproduce, the female releases eggs which are then fertilized internally by the male, and the young develop within the female until they are born. Bluefin tuna typically produce a large number of eggs, with a single female able to produce millions of eggs in a single spawning season.

Scientific name: Thunnus thynnus Scientific classification: Phylum: Chordata Class: Actinopterygii Order: Perciformes Family: ScombridaeDescription of Northern Bluefin Tuna The pectoral fins are long and rigid and are positioned just behind the conical head, with a large mouth and eyes. The back of the fish is a deep bluish-purple and the underside is shimmering silver.

Scientific name: Electrophorus electricus Scientific classification: Phylum: Chordata Class: Actinopterygii Order: Gymnotiformes Family: Gymnotidae The adult electric eel is an elongated, snake-like animal that reaches 2.5 m in length and 20 kg in weight. Due to their serpentine shape, they lack caudal, pectoral, and dorsal fins; the anal fin is well-formed and extends almost the entire length of the body.