The researchers studied the size and weight of fourteen different fish species caught off the Eastern Black Sea coast of Turkey using a bottom trawl net. They looked at fish like whiting, red mullet, and anchovy, among others. The study found that the relationship between the length and weight of these fish varied, with some fish growing in weight faster than others as they get longer. The researchers collected data over a year, from depths of 10 to 60 meters, and found that the weight of the fish could be estimated using a specific formula. The findings help us understand how different fish species grow and develop in the Black Sea.