Lauk

Lauk atawa lauk cai mangrupa vertebrata poikilotermik (getih tiis) nu hirup di jero cai maké insang. Di dunya, lauk kabagi jadi leuwih ti 27 rébu spésiés, nepi ka jadi golongan vertebrata nu loba rupana. Sacara taksonomis, lauk téh mangrupa hiji kelompok parafilétik nu hubungan di antarana paling mindeng dipadungdengkeun; babagian nu umum mah nyaéta jadi lauk tanpa rahang (kelas Agnatha, 75 spésiés kaasup belut jeung hagfish), lauk kartilagus (kelas Chondrichthyes, aya 800 spésiés, kaasup hiu), sarta sésana dina kelas lauk ipis (Osteichthyes).

Lauk téh mangrupa golongan sato anu ukuran awakna rupa-rupa pisan: ti hiu anu 16 m nepi ka impun anu ukur 2 cm, malah loba kénéh anu ukuranana leuwih leutik ti impun.

Ékologi 
Urang bisa manggihan lauk ampir di sakabéh awak cai anu badag, boh di darat anu jerona ukur puluhan sénti nepi ka sagara anu jerona rébuan méter.

Klasifikasi 
Lauk mah ngabentuk kelompok parafilétik: sakabéh kumpulan (clade) nu ngandung lauk salawasna ngandung ogé tétrapoda nu lain lauk. Lauk digolongkeun kana sababaraha kelompok utama:
 Conodonta
 Hyperoartia
 Petromyzontidae (lamprey)
 Pteraspidomorphi (lauk tanpa rahang kuna)
 Thelodonti
 Anaspida
 Cephalaspidomorphi (lauk tanpa rahang kuna)
 Galeaspida
 Pituriaspida
 Osteostraci
 Gnathostomata (jawed vertebrates)
 Placodermi
 Chondrichthyes (cartilaginous fish)
 Acanthodii
 Osteichthyes (bony fish)
 Actinopterygii (ray-finned fish)
 Sarcopterygii (lobe-finned fish)
 Actinistia (coelacanths)
 Dipnoi (lungfish)

Pikeun klasifikasi anu leuwih lengkep, mangga tingal artikel vertebrata.

Baca ogé 
 Sato
 Akuarium
 Lauk sagara jero
 Anatomi lauk
 Migrasi lauk
 Nguseup
 Ihtiologi (ulikan ngeunaan lauk)
 Daptar kulawarga lauk
 Daptar ngaran umum lauk
 Ostrakoderma - lauk munggaran
 Lauk prasajarah

Tumbu kaluar 

 70South - information on Antarctic fish 
 A World of Fish Species information and fish care
 Fish database (FishBase)
 Join Ray Mullet in the Fish Olympics!
 Project for children - build a fish mobile with a behavior 
 Fish Keeping 
 Site with one of the largest fish databases in the world
 Reelinthefish.net | Interview with Dr James K. Oliver, Reefbase Scientist 
 Fishy.Us Articles & Particles
 Saltwater & Freshwater Forums
 Help on raising Aquarium Fish
 Aquarium Fish Education
 Fish and Seafood Recipes Cooking With Fish
 Reef aquarium community and learning center
 German Educator in Fisheries, Specialist in Fancy Goldfish and Fishhealth, with Forum and large Picture-Gallery
 Fish  Aquarium simulator for mac.
 AroFanatics Website one of the most popular fish-keeping forum.
 The Aquarium Fish Tank Friend
 Information about fish - Wild Animals Online encyclopedia
 Minnesotas Foremost Fishing, Hunting, and Outdoor Community  - réad Stories, Download our Newsletter, Join our Club!

Chordata
Ékologi akuatik