A little about fishing with nets around Puerto Penasco........
I'll not get in to the trawlers here as I've been over it plenty in previous posts.
Depending on what type high profile collateral kill being discussed, Vaquitas, Totoabas, or Sea Turtles the comercial pangas boats are the worst offenders. They typically use two types of monofilament based nets, tangle nets for shrimp and gill nets for fish.
The tangle type is basically a curtain of loosely matted mono with a few knots here and there to keep it sheet like when draped along a line suspended with soda pop bottle floats. The rig may be anchored a one end to keep it from drifting with the extreme local tides, or have a radio beacon on the rig using a stick or length of pvc pipe. This type of rig is what brings in most of the super-sized Gulf Blue Shrimp and they are usually set in relatively shallow water and don't reach the bottom. The shrimp come up from the bottom at night and feed on plankton. Do a night dive on any sandy bottom out there to observe this. I've had pretty good luck catching them at night off of Sandy Beach with a powerful dive light and a live bait net.
The swimming feeding shrimp contact the loose monofilament and their spiny heads, tails and legs get entangled and that's were they stay until the pangueros return the next day and pull em up. Back in the 70's I would get good hauls from the pangueros after getting them to come to shore as they were returning to their camps to unload. Even in those days they never had any sort of exceptional hauls, maybe forty or fifty big shrimp. Few if any of those huge shrimp are ever available in RP as they are worth much more to when sold to the overseas customers. I don't believe the tangle nets are responsible for very much by-catch as they are checked daily and are relatively visible to passing fish. They do catch diving birds, especially Loons and Grebes seeking smaller fish and shrimp.
Gill nets are a whole other issue. The gill net as the name suggests catches fish after their heads pass through a pre-determined opening of monofilament then if they try to back out they are stopped and held in place by their gills. Now of course this won't catch every fish that comes in contact since a lot of fish have heads bigger than their bodies or are small enough to just swim through the opening. Gill nets target certain types of fish and in the northern Sea of Cortez those fish are Corvinas and their big cousin the Totoaba. Last summer I saw the pangueros at El Jaguey coming in with hundreds of pounds of Corvinas on every boat. Every fish was almost the exact same size as they were limited by the size of the holes in the gill nets.
They had a few Sierras, Mexican Barracudas and Cabrillas but 99% of the catch was Corvinas. Another thing to consider is that the fish that they are targeting are all migrating schooling types. Just imagine what a Sea Lion does when it comes across a half mile of gill net loaded with fresh fish. Just go out to Isla San Jorge to see the results, there are always a few Sea Lions there, especially younger ones with a bloody necklace of monofilament cutting through their skins facing certain death.
Well, I gotta throw some fresh Sea Lion steaks on the bar-be-cue, more later,
JJ
PS......Hey Joe why so quiet?
Just ignore those dead beats from the Rotting Rats forum below as they are pretty hard pressed to spew out more than a five word response to anything we have to say here.
Gotta pick up my new 2017 Gen2 Ford Raptor S-Crew manana.