Hey Eli,
The best way to get them to stop following you is to haze the crap out of them before they eat that first fish!
Remember, that they cannot tear apart and eat your fish while they are underwater. When you see a pinniped while you have a fish on, have everyone on board get their gear up quickly and get the boat on top of that fish!
If the furbag gets your fish, keep the line tight and keep the boat on top of him.
NOAA has identified legal means to protect your gear and catch. Here is the link:
http://swr.nmfs.noaa.gov/deter/Dets_Fisher.htmHere's the gist of the info on that page:
The following list of "potential methods" and "deterrents to avoid" is not an exhaustive list of non-lethal methods or techniques. If you have questions about protecting your property and/or fishing gear and catch from nuisance Pacific harbor seals and California sea lions, please contact Marine Mammal Specialists (562-980-3232) or NOAA's Office for Law Enforcement (1-800-853-1964).
Potential methods for use by fishers to deter Pacific harbor seals and California sea lions from damaging gear or catch (anglers must be actively fishing with gear deployed). Visual Repellents/Noise Makers:boat hazing, circling
pounding on hull
pyrotechnics (e.g., bird screamers, bangers, underwater firecrackers, cracker shells)
starter pistols*
horns, bells, whistles
Physical Contact:sling shots
paint ball guns* (paint balls must be non-toxic and water soluble)
non-lethal ammunition (e.g., rubber bullets, sabot rounds, game stingers)