Flathead Catfish Age and Size at Maturation in Texas

One hundred ninety-nine flathead catfish Pylodictis olivaris, ranging in total length from 290 to 999 mm, were collected from 31 Texas reservoirs to determine the relationship between size and age at sexual maturation. Logistic regression indicated that length, age, and geographic location of capture were significantly related to sexual maturity. Weight was significantly related to maturity only if length was not included in the model. There was no difference between males and females in length at maturity. Five models were developed to predict the proportion of mature fish within a population. A length-only model derived for predicting sexual maturity indicated that 50% of flathead catfish reached sexual maturity at 390 mm. This information was used to help establish new statewide length limit regulations based on the desired level of protection of the sexually mature population.