GDSD - I know a guy that has been piping for 12 years in the same area and the # of catfish he sees/catches grows each year. The pipes give the catfish a protected place to spawn/lay eggs. It only takes 5-7 days for catfish eggs to hatch after layed; so the chances of hendering the catfish eggs from hatching are low unless you go every week and/or multiple times a week. If you miss a week you may have just allowed all of your pipes to become a safe haven for a complete catfish spawn/protect cycle. I don't think it hurts the spawn or else it would be illegal.
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