Pond Boss Forums MANAGING AN EXISTING POND Evaluating and adjusting fish populations GSF

GSF at 1 year old and 3"-4" long will usually spawn at that age and size. Look again at the pictures of the fish in the 1st picture in your post above. Notice the emerald or blue-green streaks on the gill cover just below the eye. Those noticeable and distinct streaks are characteristic of GSF. When you catch any fish with those streaks feel confident to remove that fish as a GSF or one with lots of GSF genetics.