4.7 KiB
Breeding and partners
How pairs form, the real odds of an egg, and where to read them.
Pairs breed by themselves
Breeding is automatic. A female and a male of one species in the same aquarium pair by chance once both are grown, healthy (60% or more) and rested. There is no button to start it: you steer with who lives together, how well they are kept, the Conditioning Box and incubation.
After a clutch each parent rests 48 hours, and the same two fish wait a week before they pair again; either may pair with someone else meanwhile. Your first fish and legendary fish do not breed, and a chance that comes while the aquarium is full is missed, so keep a free place for the egg.
The odds
Every six hours (00:00, 06:00, 12:00 and 18:00 server time) each ready pair gets one roll at 5.4%. The windows are independent, so the odds add up like this:
- About 1 in 5 within a day (20%).
- Half of ready pairs lay within 3 days.
- 79% within a week and 95.5% within two weeks.
- An average wait of about 4.6 days once ready.
- With the pair's week between clutches, about 0.6 eggs a week or 2.5 a month.
What an egg can be
The weaker parent decides the chance. An egg can only step above its care from the lower of its two parents' tiers: two gold parents give one tier up a quarter of the time, diamond parents one tier half the time and two tiers a tenth, purple diamond parents two tiers a fifth. A gold fish paired with a silver one gives no step at all, so raise the weaker parent first.
Incubating a bred egg keeps it until 36 hours and lifts those odds (gold 50%, diamond 70% and 20%, purple diamond 70% and 30%); below gold it gives a 20% chance of a bronze head start. The roll itself is made when the egg is laid and stays secret, so incubating never makes an egg worse. Colour comes from one parent nine times in ten, and each bred generation after the first sells 2% less, never below ×0.90.
Conditioning for Breeding (Research) adds 10 percentage points to the chance of a higher tier for the next egg of a fish that rested 3 days on its loved food, plain or incubated. The Breeding odds table shows the conditioned figures. Other Breeding levers: the Hatchery hatches one incubated egg at a time at 30 hours instead of 36, and Parent Care makes a growing fry's care grow 10% faster while a parent lives in its water. The Breeder crown adds Matchmaker, which makes a pair you mark as Matched wait 5 days between clutches instead of 7, and Bloodline, which lifts an incubated egg's odds by 10 points.
A fair order
When one fish has two ready partners, each six-hour window a fair draw decides which pair rolls first, so neither partner is always ahead. The pace does not change: each pair's own chance stays 5.4% a window.
Variants
A fish's Variant is what it hatched as, and it never changes. A rare colour, ink (6% of shop eggs) or coral (2%), is one nacre scale, shown on the fish card, in My Fish and in the hatch toast, and in the aquarium itself on Coral Clownfish, Lagoon Boxfish and Panther Grouper. Colour comes from one parent nine times in ten. The Reef Journal marks the rare colours and the morph your fish wear now as found.
Two scales mark a morph, a species' own painted pattern: the two-band Coral Clownfish is the first. A bred Coral Clownfish egg hatches as one 1 time in 32 (a shop egg never does); one morph parent passes it on one time in three, two morph parents half the time. Three scales are kept for evolved forms, which are not in the sea yet. A Variant changes no price, odds or XP.
Very rarely a team comes home from an expedition with a wild egg of one of its species. It waits in your Pantry and is never sold back to the game, but it can go on your stall. A wild egg is generation 0, twice as likely to be ink (12%) or coral (4%), and can hatch as a morph 1 time in 32. On the stall a morph lists against 1.5 times its species' reference, inside the usual band. The game still buys every Variant at its plain price.
Where to read it
Every keeper sees every number:
- The fish card's Family tab lists the partners in its aquarium with each pair's status (growing, resting, the pair's week, unwell, no room, ready) and its odds.
- A bred egg's card shows what it can hatch as, normal beside incubated.
- The Breeding app in the Menu shows every pair of every aquarium, the eggs a week, and the pair planner for any female and male of one species you own.
In the game: https://fishies.lol/wiki/mechanics/breeding · Fishies 0.8.24
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