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Entrance view. The Lisbon Oceanarium has a large collection of marine species — penguins, seagulls and other birds; sea otters (mammals); sharks, rays, chimaeras, seahorses and other bony fish; crustaceans; starfish, sea urchins and other echinoderms; sea anemones, corals and other cnidaria; octopuses, cuttlefish, sea snails and other mollusks; amphibians; jellyfish; marine plants and ...
Pacific sea nettles, Chrysaora fuscescens. Cnidaria (/ n ɪ ˈ d ɛər i ə, n aɪ-/ nih-DAIR-ee-ə, NY-) [4] is a phylum under kingdom Animalia containing over 11,000 species [5] of aquatic invertebrates found both in fresh water and marine environments (predominantly the latter), including jellyfish, hydroids, sea anemones, corals and some of the smallest marine parasites.
Sea anemones and their attendant anemone fish can make attractive aquarium exhibits, and both are often harvested from the wild as adults or juveniles. [39] These fishing activities significantly impact the populations of anemones and anemone fish by drastically reducing the densities of each in exploited areas. [ 39 ]
A marine aquarium is an aquarium that keeps marine plants and animals in a contained environment. Marine aquaria are further subdivided by hobbyists into fish only (FO), fish only with live rock (FOWLR), and reef aquaria. Fish only tanks often showcase large or aggressive marine fish species and generally rely on mechanical and chemical filtration.
Cnidarians include corals, sea anemones, jellyfish and hydrozoans. They form a phylum containing over 10,000 [ 32 ] species of animals found exclusively in aquatic (mainly marine) environments. Their bodies consist of mesoglea , a non-living jelly-like substance, sandwiched between two layers of epithelium that are mostly one cell thick .
Ctenophores resemble cnidarians in relying on water flow through the body cavity for both digestion and respiration, as well as in having a decentralized nerve net rather than a brain. Also like cnidarians, the bodies of ctenophores consist of a mass of jelly, with one layer of cells on the outside and another lining the internal cavity. In ...