Clarias gariepinus and Oreochromis niloticus are two hot-water fish species of African origin that have been recently reported to occur unnaturally in hot-water resources and springs in the Sakarya River Basin (northwestern Turkey). Within effective planning strategies to maintain native biodiversity, monitoring fishes’ well-being can be useful to evaluate the status of nonnative fish populations and their degree of adaptation to new environments. Relative weight (Wr ) is a condition index widely used to estimate the well-being of fish by comparing the actual weight of a specimen with a standard weight (Ws ) that is the ideal weight of that fish at that length. |
