You're probably thinking of the National Marine Fisheries Service under NOAA for recreational fishing (under Dept. of Commerce, not Homeland Security). The Coast Guard, under DHS, enforces Magnuson-Stevens and the other conservation acts farther offshore where the commercial vessels fish.

And your point is well taken about DHS (as a department), but administrative organization seems to me to be a completely different problem than sinister-sounding "security theater," which is how the article paints pretty much all efforts associated with "homeland security".