 Bigfin reef squids have one of the fastest recorded growth rates for any large marine invertebrate . They can reach 600 g ( 1 @.@ 3 lb ) in only four months . Nonetheless , size can not often be reliably correlated with age , as variations of body size within a generation is fairly common . In captivity , bigfin reef squids have a lifespan of 161 to 315 days for both sexes . 
