AQUAPEDIA / VERIFIED BREEDER RESEARCH / 2026

Medaka breeders: 2026 first-party cross & show records

Six source-scoped original breeder and organizer statements with verified Instagram identity links.

Research status: public source summaries, not DNA-verified genetics. No private Facebook posts, unread Instagram captions or unlicensed photos reproduced.

Original breeder social identity ↗

Illustrated breeder-source lineage: Elsa

Dashed connectors represent Savanna-reported stock inputs and subsequent selection, not individually DNA-verified parent fish or fixed Mendelian inheritance.

Visual Medaka lineage for Elsa (エルサ). Dashed connectors show breeder-reported input or selection history; they do not prove actual parent pairs, alleles, or dominance.REPORTED INPUT / STAGE 1Miyuki Hikari-body Matsui SwallowLongfin, high-fin typeREPORTED INPUT / STAGE 2Fromage KissingFOCAL STRAINElsa (エルサ)
Dashed connectors show breeder-reported input or selection history; they do not prove actual parent pairs, alleles, or dominance. Parent fish IDs are not independently established.

Emerald Moon: phenotype inputs, not a confirmed cross

The breeder named traits, but did not publish the sexed individual parent pair. No ancestry arrows are drawn for these independent traits.

Emerald Moon phenotype clues. No documented direct mating edges.REPORTED TRAITGoblin-associated guanineREPORTED TRAITEarth Eye phenotypeSELECTED PHENOTYPEEmerald Moon
Named phenotype features only; individual parent lines unknown. Not an experimentally resolved genotype.

Elsa

What the source says: Savanna describes breeding Miyuki Hikari-body Matsui Swallow Longfin high-fin type with Fromage Kissing stock followed by multigeneration fin selection until satisfactorily consistent individuals were produced.

Evidence class: BREEDER_CLAIM

Source owner: Medaka-ya Savanna · Source date: Date not separately established

Read original source ↗ · Verified breeder social account ↗

Still not proven: sexed parents; individual founding fish pedigree; molecular inheritance; F1/F2 counts

Emerald Moon

What the source says: Savanna attributes the distinctive emerald appearance to utilization of Goblin-associated guanine and Earth Eye traits, with guanine extending toward the snout.

Evidence class: BREEDER_CLAIM

Source owner: Medaka-ya Savanna · Source date: Date not separately established

Read original source ↗ · Verified breeder social account ↗

Still not proven: whether Goblin and Earth Eye were direct parents; sexed founders; single-locus inheritance; molecular confirmation

Elsa × Featherlight

What the source says: Savanna's entry 8A finished first in the 2026 Mariage-type longfin, normal-body category: online judging 94, venue judging 710, total 804 points.

Evidence class: ESTABLISHED_EVENT_RESULT

Source owner: Medaka Gachi Battle official committee · Source date: 2026-09-25

Read original source ↗ · Verified breeder social account ↗

Still not proven: Elsa and Featherlight constituted a direct sexed mating pair; current breeding stability; inherited genotype; originator credit to Savanna for Featherlight

Competition-specific result: Medaka Gachi Battle 5 · Mariage-type longfin, normal body · entry 8A · 1 place · 804 official points

Elsa × Featherlight

What the source says: The official competition published Savanna's entry 8A in first place in its 2026 MVP result: 17 online votes/points and 245 venue points, total 262 under separate MVP scoring.

Evidence class: ESTABLISHED_EVENT_RESULT

Source owner: Medaka Gachi Battle official committee · Source date: 2026-09-26

Read original source ↗ · Verified breeder social account ↗

Still not proven: MVP total is additive to category score; specific Elsa/Featherlight mating ancestry

Competition-specific result: Medaka Gachi Battle 5 · MVP · entry 8A · 1 place · 262 official points

黒輪刀

What the source says: Official 2026 Korean MVP results credit Tarumi Masaharu (垂水政治) with entry 1C 黒輪刀 and second place, 31 votes.

Evidence class: ESTABLISHED_EVENT_RESULT

Source owner: Medaka Gachi Battle official committee · Source date: 2026-09-26

Read original source ↗ · Verified breeder social account ↗

Still not proven: Tarumi created the strain; correct romanization/pronunciation; genetic parents; brood counts

Competition-specific result: Medaka Gachi Battle 5 · Korean MVP vote · entry 1C · 2 place · 31 votes

木口系ロングフィン

What the source says: Official category table credits entrant Hideki Kiguchi with entry 8F 木口系ロングフィン (Kiguchi-line longfin), online 24, onsite 60, total 84; do not infer breeding pedigree.

Evidence class: ESTABLISHED_EVENT_RESULT

Source owner: Medaka Gachi Battle official committee · Source date: 2026-09-25

Read original source ↗ · Verified breeder social account ↗

Still not proven: individual creator credit; line origin; genetic mechanism

Competition-specific result: Medaka Gachi Battle 5 · Mariage-type longfin, normal body · entry 8F · 84 official points