Searun, with your nonsensical statement - "The slot had nothing to do with "reducing the size harvested" it had everything to do with trying to keep the average size of fish caught down", no kidding we're not connecting! I'm sure even you now realize that the two are exactly the same thing and that if a slot regulation does not affect the average size of fish being harvested, specifically reducing it, than it was not an effective management action.
Ratherbefishing - your simple model for how an over-under slot would work - assuming that half of fish harvested would be slot fish, is exactly why the slot didn't work, because that assumption is way off of reality. Reality is that on any given day the majority of anglers targeting halibut will not be harvesting a slot fish. The majority will be local day trippers who never target a slot fish, one time charters again who never target a slot fish, unsuccessful anglers who even on 2+ day trips only manage a single hali, those high grading and thus only target one big fish and don't bother with a ping pong paddle 10lber and those who only get hali as incidental bycatch while targetting salmon or other fish. As such, I'd be very surprised if more than 20% of harvested halibut in 2012 were "slot" fish and wouldn't be surprised at all if it were closer to 10%. Once you get down to those low numbers of theoretical lbs saved, you get inside of the very large error in the way the Rec harvest is estimated. The very inconsistent creel surveys and overflight methodology DFO has been using, if released to the larger science community for scrutiny would likely have an error range of 50-100% or even higher - it's that inaccurate and unreliable.
If you look at how slot limits are applied across other jurisdictions they typically apply to all fish harvested - that way there is certainty and control over your harvest management. Whether it be a slot like Alaskan lingcod where all fish under a certain length and over a certain length must be released or slots like walleye in some Alberta lakes where all fish within the slot must be released, with a set number of undersized fish allowed for harvest and an allowance for one "trophy" fish. Managing in this way does two things. 1) It provides certainty with regards to the expected size harvested based on the designated slot and thus managers can forecast total harvest based on length of season and anticipated effort. 2) It allows managers to assess the available biomass within each of the size class categories and protect certain aspects of it, whether that means protecting small recruiting fish, fish at and in their first years of maturity or large spawning fish.
The one over, one under approach achieves neither of those two key management objectives - as we saw in 2012 there is no certainty of average harvest size and thus no way to forecast expected total harvest based on a set season and expected effort level. It also doesn't protect any part of the population as all size classes are available for harvest.
What I'd like to see is for all the interest groups to come together and pool their resources and contract a couple of reputable fish management consultants to do two things: 1) assess all the available management regulations that could be used to manage Rec TAC and 2) For them to propose a couple of graduated management models that have varying regulations and seasons depending on the available TAC. Regardless of the 85:15 split, even if it were 50:50 we'll have a TAC that needs to be managed and I get the feeling that the IPHC will be moving to a more conservative biomass forecasting model. It may not have been accepted this year but it may be inevitable eventually. Such a graded model would have a red line - a TAC so small that a season that gives fair access is impossible and a green line above which we'd have a full season with 2/day and 3 possession. In between, there'd be various management actions depending on the TAC that season - shortened seasons, max size limits, true slots, etc, etc, basically whatever the consultants come up with and can be accepted by the Rec community.
Second aspect would be to get reliable accounting for harvest so we have some certainty and don't have to rely on the creel survey/overflight approach. That should be a no-brainer but not sure if it does have the support of the larger Rec community or how it would be implemented.
Anyway, I'm done arguing with you Searun, if you haven't figured this out by now I think we'll just have to agree to disagree.
Ukee