Length weight relationship parameters were determined for 17 fish (Arnoglossus kessleri, Blennius ocellaris, Callionymus lyra, Cepola macrophthalma, Citharus linguatula, Lesueurigobius friesii, Merluccius merluccius, Lophius piscatorius, Merlangius merlangus, Gobius niger, Mullus barbatus, Solea solea, Spicara maena, Serranus hepatus, Trachurus trachurus, Trachurus mediterraneus, Uranoscopus scober) species in the Marmara Sea. Fish samples were collected monthly bases between September of 2011 and July of 2014 with a beam trawl. The growth type of each species were determined and the calculated b values changed in range from 1.2565 to 3.4018.