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Merge Planning

PC FISH Synthesis Guide

Use the Quick Merge Guide to separate Normal Merge from Season Merge before spending fish on PC FISH synthesis.

Regular vs season-specific

Quick Merge Guide

Normal Merge is for non-season merge attempts with unpublished current odds. Season Merge is the separate Season 1 recipe route for Seasonal Fish. Check the route first so unknown regular rates do not make confirmed Season 1 recipes look unknown.

Confirmed action; exact rates unknown

Normal Merge

Use this for non-season merge attempts only after checking rarity, current market value, and patch status. The August 18 server update fixed a merge-success-rate issue, but no public table gives current regular merge probabilities.

Confirmed Season 1 route

Season Merge

Use this for Season 1 Seasonal Fish. Frostblue Sunfish, Limeback Sea Turtle, and Matsuri Octopus use named Season 1 ingredient recipes and star requirements, not Normal Merge or breeding.

Evidence labels required

Confirmed vs unconfirmed

Use official notes for confirmed rules, community-tested logs for reproducible samples, and unknown labels where rates or market behavior are not proven.

Confirmed findingWhat it meansSourceSample basisConfidenceVerified
A merge-probability issue was fixed with a server-side update.Confirmed by the developer; the announcement does not publish the resulting probability table.PC FISH August 18 UpdateNot applicable — official patch statementOfficial2026-08-31
Fish Merge II confirms the game tracks 10 completed fish merges.Confirmed Steam achievement condition; it proves the merge action and counter exist, not the success odds for any recipe.Steam global achievementsNot applicable - platform achievement conditionOfficial Steam listing2026-08-31
Seasonal fish use season synthesis and cannot be obtained through regular synthesis or breeding.Confirmed rule for the announced first season; use the Season 1 page for recipe inputs.The First Season of PC FISH is Coming Soon!Not applicable — official season ruleOfficial2026-08-31

Before You Merge Seasonal Fish

  1. 01Check whether the target is a seasonal fish. Seasonal fish use the season route, not regular synthesis.
  2. 02For Frostblue Sunfish, Limeback Sea Turtle, or Matsuri Octopus, use the Season 1 recipe page and verify the required star levels before consuming ingredients.
  3. 03Record the exact inputs and visible star ranks before confirming. This preserves evidence even if the merge fails.
  4. 04Do not convert an isolated result into a percentage. A useful rate needs a reproducible log with successes, failures, game version, and total attempts.
Open Season 1 recipes
PC FISH Breeding CalculatorEstimate community-tested rarity outcomes for PC FISH parent pairings before you commit a breeding slot.PC FISH Breeding ChancesCompare the community rarity table by parent pairing, with its source status, missing sample size, and verification date shown beside the numbers.PC FISH Breeding CombinationsTrack PC FISH parent pairings, rarity outcomes, and unknown breeding combinations without guessing unverified species results.PC FISH Fish DatabaseA launch database structure for PC FISH species, rarity, source, grade, and market notes.