Oh, in that case I'm sorry, there is probably nothing you can do to recover these negatives. These are probably marks caused by the developer when it was poured onto dry film. Which drum did you use? With 2509 the only way I could get even development is to do a prewet before the developer step. It is helpful anyway to bring the drum and film to the correct temperature. 5 min dry preheat is not sufficient. Instead of the preheat, do two 30sec prewet cycles with water of correct temperature. This gets the best result for me.