As stated earlier the reproductive cycle of dog fish is VERY slow so killing a couple each time you go out fishing can impact the population. Especially if it is a common practice amoungst all salt water fishers. Squafish bounties were mentioned earlier as being possibly the same thing but there is one very important difference squawfish are a non native species. How would you feel if you saw me on the river killing every chum I landed because I was targeting silvers and the chums were annoying me? I probaly would get beat I imagine. Killing for killings sake is not some thing I agree with so just cut the leadere and move on.