Re: Spiny Dogfish as bait?
I tried barbecueing one once, but it was gross. I would try it again though with another recipe. I am with rolmops on the killing stuff just for the fun of it, or because it is in our way. I cringe just thinking about it. How is that a way to show respect for life/creation/etc?
As for commercial interests, don't even get me started. Some of those guys would like to kill off everything that doesn't have a market value this week. And of course, if you ask a commercial fisherman, nothing they have ever done has ever had a negative impact on fishing. It's ALWAYS someone else's fault. To be fair, a lot of sport fishermen are the same way.
Ecosystems are more complicated than our narrow human commercial interests can account for, and if there wasn't a purpose for the spiny dogfish to fulfill, then god/evolution (take your pick) wouldn't have created them.