Dabbobin ruwa sun shiga cikin manyan nau'ikan 2: vertebrates da invertebrates. Vertebrates suna da kashin baya; invertebrates ba su da.
Masana ilimin kimiyyar sararin samaniya sun rarrabe manyan azuzuwan dabbobin ruwa da aka sani da nau'uka:
- jellyfish da polyps;
- arthropods;
- kifin kifi;
- annelids;
- ɗanɗano;
- mahada.
Dukkanin kashin baya sune abubuwan sha'awa, gami da: whales, sharks da dolphins, amphibians, dabbobi masu rarrafe da kifi. Kodayake tekuna gida ne ga miliyoyin kayan masarufi, amma babu kashin baya kamar yadda yake da masu juya baya.
Akwai manyan ƙungiyoyi 17 na ɓarna waɗanda ke rayuwa a cikin teku, misali: crustaceans, semi-chordates da sauransu.
Giant shark
Bigmouth shark
White shark
Tiger shark
Bakin shark
Katran
Kifin kifin kifin
Dwarf shark
Ruwan ruwa mai kifin shark
Baƙin kifin shark
Whitetip shark
Dark fin shark
Lemon kifin
Rek shark
Ruwan shark na kasar Sin
Achedarjin kare shark
Harlequin shark
Shark
Wobbegong shark
Sauran dabbobin ruwa
Brownie shark
Shark-mako
Fox shark
Hammerhead shark
Silk shark
Yankin Atlantic
Bahamian ya ga shark
Shuɗin whale
Kifin Whale
Grey whale
Whale mai tsalle-tsalle (Gorbach)
Finwhal
Seyval (Saidyanoy (willow) kifi)
Minke whale
Whale ta Kudu
Mahaifa maniyyi
Pygmy maniyyin kifi
Belukha
Narwhal (Ba da daɗewa ba)
Dan wasan ninkaya na Arewa
Dogon fuska kwalba
Moray
Dabbar dolfin kwalba
Motley dolphin
Grinda
Grey dolphin
Orca talakawa
Kilananan kifin whale
Dogon dolphin da ake biyan kudi
Babban dolphins
Ross hatimi
Damisa ta teku
Giwar Ruwa
Kurege na teku
Walrus na Pacific
Walrus na Atlantic
Laptev walrus
Zakin teku
Manatee
Kifin teku mai kafa takwas
Kifin kifi
Squid
Kagen gizo-gizo
Lobster
Spin lobster
Dokin Tekun
Jellyfish
Molluscs
Kunkuruwar teku
Emidocephalus mai ringi
Dugong
Kammalawa
Areananan dabbobin ruwa masu rarrafe ne. Yayinda mafi yawan dabbobi masu rarrafe ke rayuwa a doron kasa ko kuma shan ruwa a cikin ruwa mai dadi, akwai jinsunan dake rayuwa a cikin tekuna. Mafi shaharar wadannan sune kunkuru. Suna rayuwa tsawon shekaru, suna girma. A cikin teku, manyan kunkuru ba su da abokan gaba; suna zurfafawa don neman abinci ko guje wa haɗari. Macizan tekun wani nau'in dabbobi ne masu rarrafe da ke rayuwa a cikin ruwan gishiri.
Dabbobin ruwa sune tushen abinci mai mahimmanci ga mutane. Mutane suna samun abinci a teku daban-daban kuma a kan manyan jiragen ruwa, abincin teku yana da daɗi, lafiyayye kuma mai rahusa fiye da naman dabbobi masu dumi.
