Do Aquarium Shrimp Prices Actually Move? We Measured.
Nearly 12,000 listing-day observations across seven US vendors — and not one genuine repricing of a dwarf shrimp listing. What that means for buyers.
Published July 29, 2026 · figures recomputed from data through November 10, 2026 · by Shrimp Price Index
Hobby folklore says to wait for a sale — that shrimp prices dip and spike and a patient buyer catches the dip. Because this index re-reads the complete public catalogs of 7 US shrimp vendors every day, we can test that belief directly, at the level of individual listings.
The test is strict on purpose: we follow each specific listing (the same vendor, the same product variant) from one daily snapshot to the next and count only genuine repricings — a numeric price becoming a different numeric price. A listing going in or out of stock is tracked separately; a morph's median wobbling because the in-stock mix changed doesn't count. Nothing here is survey data or vendor claims.
The result: prices barely move
Since July 15, 2026 we've made 101,494 day-over-day comparisons of individual dwarf shrimp listings. The price changed in 14 of them — a move rate of 0.014%, with 10 cuts and 4 increases. The busiest repricing days were October 22, 2026 (5), August 4, 2026 (4), September 5, 2026 (2).
And the stillness is a fact about the shrimp market, not about the stores being asleep: through July 23 the same stores repriced their other livestock — fish and snail listings — 89 times in the same kind of day-over-day comparison. Their shrimp shelves alone held perfectly still. (That figure comes from a portfolio-wide price-movement audit run on 2026-07-23 across this index's raw snapshots; it's a historical statement about that window, not a live number.)
What moves instead: stock
Over the same window we counted 694 availability flips — a listing going in or out of stock against 14 repricings. That matches how small-batch livestock retail actually works: colonies sell out, a new batch matures, the listing comes back — at the same price. The market's real volatility is in what's available, not what it costs.
| Vendor | Shrimp listings (latest day) | In stock | Repricings observed |
|---|---|---|---|
| Superior Shrimp Aquatics | 248 | 248 | 0 |
| Shrimpy Business | 205 | 158 | 0 |
| Tropicflow | 145 | 67 | 0 |
| Flip Aquatics | 144 | 27 | 12 |
| Coast Gem USA | 66 | 46 | 0 |
| The Shrimp Farm | 38 | 32 | 1 |
| Teacher's Pet Aquatics NW | 35 | 16 | 1 |
Tracking note: The Shrimp Farm has a 7/21–7/27 gap in our history (a collector rebuild on our side, not a vendor event); gap days simply aren't compared, so the gap can't create or hide a repricing.
What this means if you're buying
- The median is trustworthy. Because prices hold still, a morph page's median isn't a snapshot of a jittery market — it's a stable benchmark you can compare a quote against with confidence.
- Waiting for a dip is a losing strategy. The price history says the dip isn't coming. If you've found the morph you want at or below its cross-vendor median, the thing to time is availability — colonies of popular morphs go out of stock and stay out.
- A "sale" needs reading carefully. With genuine repricings this rare, discount messaging is almost always standing merchandising rather than a fresh cut — we measured that gap in Sale tags vs. real price drops, and anything we do watch get cheaper lands on the price drops page.
Honest limits of this measurement
This window covers 119 days in midsummer and online listings only. Seasonal patterns (breeding seasons, holiday promotions) may move prices in ways a July window can't see; local fish stores may behave entirely differently. We'll keep publishing updates as the dataset grows — every number on this page recomputes automatically from the latest data, so if the market's first repricing happens tomorrow, this article will say so.