Skin with mucus gland. Paired fins made of rays and spines, or lobed fins lacking the rays and spines. Various types of scales (ctenoid, ganoid, or cycloid). Marine and fresh water species.Gills used for respirationExternal fertilization. Spawning. Oviparous. No external ears No eye lids Skeleton made of bone Lateral line, bilateral symmetry
What do they eat
where do they live
Average life span of tuna is between 15 and 30 years in the wild. Small percent of tuna managed to survive until this period.
There have been reports of cod that were as long as 6 1/2 feet and as heavy as 211 pounds, although the cod typically caught by fishermen today are much smaller.
lionfish can live without food for up to 3 months and only lose 10% of their body mass.