Pike are VERY aggressive. I had a grass pike in a aquarium, i dumped a dozen minnows in the tank with him. The next day all the smallerminnows were gone, and all the larger minnows had bite marks on their side from when thepike would grab them and just swim around with them in his mouth. Btw the larger ones he would just bite were about 1/2 his body length. Also pike depending on species do get very large. Some get over 4'. I caught a 36" northern last year, and thats not even a very big pike. Grass pike, and the closely related redfin stay relatively small.
