Sockeye salmon for courtship. If they waste too much energy, they might not be able to spawn. Males must also make the decision whether to invest energy in fighting for a female or for longevity on the spawning grounds. Aggressive behavior displayed by dominant males is predominantly directed towards intruding dominant males. Sometimes sockeye salmon males behave aggressively towards subordinate males. These encounters are short, with the intruding male leaving after one or two aggressive interactions. Spawning females direct their aggression primarily towards intruding females or other spawning females that are close by. However, they may also direct aggression towards intruding or
Fish stringer Fish stringer A fish stringer is a line of rope or chain along which a fisherman can string fish so they can be immersed and kept alive in water. A rope stringer "(pictured)" is the simplest type of fish stringer. It consists of a line of rope or wire with a stringing needle made of metal or hardwood at one end. The other end usually has a removable wire ring which can be used to secure the stringer. Using the needle, the stringer is threaded through the fish gill and out through its mouth, or better, it is threaded through