Card News
Field-ready shrimp farming know-how, one card at a time.
8cardsManaging pH — The Daily Swing Matters More Than the Number
pH 8.2 is a good reading. An 8.2 that was 7.6 before dawn and 8.6 in the afternoon is a different story. Here is the 0.5 daily limit and how pH changes ammonia and sulfide toxicity.
00#pH#alkalinity#ammonia
8cardsAlkalinity and Hardness — Where to Look When pH Swings
If pH moves a lot within a single day, alkalinity is short. Here is the 100–150 mg/L target, why nitrification eats alkalinity, and the calcium to magnesium ratio that builds shells.
00#alkalinity#hardness#pH
8cardsNitrification and Probiotics — They Are Not Medicine
Adding a probiotic when ammonia spikes does not lower the reading that day. Nitrifiers take 2 to 4 weeks to establish. Here is how nitrification runs and when to add.
00#nitrification#probiotics#ammonia
8cardsVibrio Control — When the Water Glows at Night
Vibrio is not a bacterium you eliminate; it is one you count. Here is the 10³ CFU/mL threshold, what green colonies mean, and what the glow is telling you.
00#vibrio#disease management#water temperature
8cardsPond Bottom Management — A Black Bottom Means You Are Late
Sludge on the bottom generates hydrogen sulfide. Keep it under 0.01 mg/L; harm is reported even at 0.002 mg/L. That is a different order of magnitude from your other parameters.
10#hydrogen sulfide#pond management#dissolved oxygen
8cardsTyphoons and Heavy Rain — Losses Come the Day After
Rainwater does not mix in. It floats as a layer on top, and the bottom below it loses its oxygen supply. Here is what to do before, during and after the rain.
00#typhoon#heavy rain#salinity
8cardsReading Pond Water Colour — Sudden Clearing Is a Warning
If the water cleared up over a few days, it did not get better — the bloom crashed, and oxygen falls that night. Here is the 30–40 cm Secchi target and how to read the colour.
00#plankton#water clarity#water quality
8cardsNitrite in Shrimp Ponds — After Ammonia Comes Nitrite
Shrimp start dying again a few days after ammonia comes down. Usually it is nitrite. Here is the 1 mg/L target, how salinity changes the risk, and the order to work through when it rises.
00#nitrite#ammonia#water quality
8cardsManaging White Shrimp Through Heat — Above 34 ℃ It Is a Different Pond
As water warms, the oxygen it can hold goes down while the oxygen your shrimp need goes up. Most summer losses start in that gap. Here is what changes above 34 ℃ and what to adjust.
00#high temperature#water temperature#white shrimp
8cardsMolting Care for White Shrimp — The Hours After a Molt Are the Riskiest
Shrimp grow only when they molt. But a freshly molted shrimp is defenceless until its new shell hardens, and its oxygen demand climbs while that happens. Here is what to watch during a molt, and how to prevent molt failure.
10#molting#white shrimp#water quality
8cardsWhiteleg Shrimp Water Quality Ranges — The Only Numbers You Need to Memorize
Temperature, pH, dissolved oxygen, salinity, ammonia and nitrite. The six daily water quality parameters for vannamei shrimp ponds, with target ranges.
60#water quality#vannamei#dissolved oxygen
5cardsOxygen Bottoms Out at 4 AM — Never Trust a Daytime DO Reading
Dissolved oxygen that reads 8 mg/L at midday can fall to 2 mg/L before dawn. Why the pre-dawn oxygen crash happens and how to prepare for it.
10#dissolved oxygen#night mortality#aerator
8cardsWhen Ammonia Rises — Five Things to Do, in Order
The same ammonia concentration is ten times more toxic at pH 8.5 than at pH 7.5. How to respond in the right order instead of panicking.
00#ammonia#pH#nitrite
7cardsEarly Signs of AHPND (EMS) — Look at the Hepatopancreas
AHPND can wipe out a whole pond within days of onset. The early signals you can catch, how to check, and what actually prevents it.
10#AHPND#EMS#hepatopancreas
8cardsStop Feeding by Instinct — Here's How to Calculate It
Work out daily feed from biomass × feeding rate, then verify with the feed tray and adjust. Overfeeding wastes money and destroys water quality at once.
10#feeding rate#FCR#biomass
7cardsMortality Diagnosis Chart — Where They Died Tells You Why
Narrow down the cause from location, timing, shell condition and colour. Distinguishing low oxygen, disease, toxicity and molt failure.
10#mortality#diagnosis#low oxygen
2cardsWe've Opened a Shrimp Farming Community Board
A place to share field experience — water quality, disease, feeding, equipment. Readable without login; only posting requires an account.
20#community#forum#shrimp farming