Сфоткал родителей — получил pedigree tree и PDF-сертификат для покупателя. Прогноз фенотипа потомства за 2 секунды.

Source signals

• SIG-20260426-sea-mainland-hobbyist-utility-th-betta-breeding-log: «If a Crowntail male breeds with a Dumbo-ear female, will the offspring be Crowntail-like?»
• SIG-20260426-sea-mainland-hobbyist-utility-th-arowana-fengshui-pricing: validates premium-fish certificate market in TH

What we ship

**Core features (MVP)**

• Pedigree tree: parent-child links, fish photos, form (Crowntail/Halfmoon/Plakat/Dumbo) and color (Marble/Koi/Galaxy)
• Phenotype-prediction LLM: 2 parents → expected offspring forms with probabilities, spawn calendar (water-change every 2-3 days, feed types per week)
• Pedigree PDF certificate (EN/TH) with QR linking to public pedigree tree — for foreign buyers
• Spawn log: start date, fry count, survival rate, weekly photo log
• LINE reminders: "water change on day 4 — today"

**Primary user flow**

1. LINE/Email signup → add first pair of fish (photo + genetics)

2. Schedule spawn → get care calendar + reminders

3. After 12 weeks — export pedigree certificate for buyer

4. Pro upgrade at 10+ fish or first international sale

**What it looks like**

• **Landing**: hero "สมุดทะเบียนปลากัด ของคุณ — ทำเหมือนฟาร์มมืออาชีพ" + pedigree tree examples + sample PDF cert
• **Main app screen**: tree view of all fish (drag-zoom), filter by form/color/age
• **Phenotype prediction**: 2-pane parent selector left, offspring with probabilities right (60% halfmoon, 30% crowntail, 10% wild)

**MVP build plan (14 days)**

• Day 1-3: backend (Fish/Spawn/Pedigree models), graph-rendering frontend
• Day 4-7: LLM prompt for phenotype prediction (betta genetics rules + Claude reasoning), validate on 10 known crosses
• Day 8-10: PDF certificate generator (TH+EN), QR to public-readonly pedigree URL
• Day 11-14: LINE reminders, Lazada affiliate widget, landing, deploy + Pantip forum post + TH-Betta-Fish FB groups

Reasoning

Thai betta breeders represent a $300M+ export industry (per bmmagazine.co.uk Apr 2026 article). Pantip topic 34303538 shows serious cross-prediction questions go to the forum because no tool exists. Topic 30609409 (10+ year archive) confirms recurring pain. Breeders sell specimens for $50-500 to US/UK — they need a PDF pedigree certificate, the AKC-equivalent for fish. Stack fits perfectly: Cloudflare PWA + Railway FastAPI + Postgres graph, no native mobile needed. **white space** — global pet pedigree tools (BreedTrace, AKC) don't cover fish; betta specifics exist nowhere.

Quick competitive read

• **AquaGenetics** — experimental enthusiast site, not TH-localized, no mobile, no PDF cert.
• **Reef Central / The Betta Source** — community forums, not tools.
• **AKC etc.**: pedigree tools only for dogs/cats/horses; no fish.
• **white space**: betta pedigree + phenotype prediction + TH locale + EN export — 0 competitors with traction.

Initial pricing hypothesis

Free — up to 5 fish, basic pedigree without PDF. Pro — 299 THB/mo (~$8) for unlimited fish, phenotype prediction, PDF cert, photo storage. Premium for exporters — $19/mo (Stripe) with whitelabel cert + multilingual export paperwork. TH 99-299 THB price band is justified for serious hobby (fish cost 500-50K THB).

Distribution hypothesis

1) TH-Betta-Fish Facebook groups (100K+ breeders) — post pedigree-cert example; 2) Pantip Klongbangrak forum reply to topic 34303538; 3) Direct outreach to top-10 Bangkok/Nakhon Pathom exporters; 4) Instagram ads on TH-betta keywords (most active hobby fandom in TH); 5) for foreign buyers — SEO "betta pedigree certificate" (niche white).