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Fish Tools & Calculators

Interactive calculators, guides, and quizzes built for fish farmers, aquarists, anglers, educators, and students. No sign-up required.

27 tools
5 audience categories
100% free, no sign-up
🍽️ For Seafood Consumers 2 tools

Understand what you eat - mercury safety, water quality context, and safe serving guidance backed by FDA/EPA data.

⚗️
Mercury Safety Calculator
Enter your body weight, fish species, serving size, and eating frequency. Get your estimated weekly mercury intake vs the FDA/EPA safe limit - personalised for adults, pregnant women, and children.
🤰 Pregnancy🧒 Children📊 FDA/EPA
Open calculator
💧
Water Parameters Guide
Enter your aquarium or pond water readings - pH, temperature, ammonia, nitrite, nitrate - and get instant colour-coded status indicators with advice for freshwater and marine tanks.
🧪 pH & hardness☣️ Nitrogen cycle
Open guide
🐠 For Aquarists 1 tool

Plan and maintain healthy aquariums - stocking levels, water chemistry, and tank setup guidance.

🐠
Aquarium Stocking Calculator
Calculate how many fish your tank can safely support. Bioload-adjusted stocking recommendations for freshwater, marine, and nano tanks. Avoid overcrowding before it happens.
🌊 Freshwater🪸 Marine🔬 Nano
Open calculator
🏞️ For Fish Farmers 11 tools

Production planning, cost analysis, and farm management tools for pond, RAS, and cage aquaculture systems.

🐟
Farm Stocking Calculator
Recommended stocking density, daily feed quantity, expected yield, and harvest timeline for your pond or tank. Supports tilapia, catfish, carp, salmon, and custom species.
🏞️ Pond🏭 RAS📈 Yield
Open calculator
📊
FCR Calculator
Compute your Feed Conversion Ratio with optional mortality correction. Benchmark against industry standards for tilapia, catfish, salmon, and carp. Includes feed cost and profit impact analysis.
🐟 Mortality💰 Cost
Open calculator
🐠
Stocking Density Calculator
Optimal fish stocking density for your pond or cage by species, system type, and aeration level. Outputs fish/m³, kg/m³, and total fish count with overcrowding warnings.
📐 Density/m³💨 Aeration
Open calculator
💰
Profitability Calculator
Full farm profitability and break-even analysis: fingerling cost, feed cost, FCR, survival rate, market price, and dressed yield. Outputs net profit, ROI, and break-even price per kg.
📈 ROI⚖️ Break-even
Open calculator
📈
Growth Rate & Harvest Estimator
Estimate days to harvest based on species, current weight, target weight, water temperature, and feeding rate. Outputs a weekly growth timeline table and temperature performance preview.
🌡️ Temp effect📅 Harvest date
Open calculator
📐
Pond & Tank Sizing
Work backwards from your target production output to the pond or tank dimensions you need. Calculates surface area, volume, optimal depth, and number of ponds required.
🏞️ Pond design🏭 RAS sizing
Open tool
🧪
Water Quality Thresholds
Species-specific water quality reference. Select your species and system type to see optimal and critical thresholds for dissolved oxygen, pH, ammonia, temperature, and more.
🐟 Per-species⚠️ Critical limits
Open guide
🍽️
Feeding Schedule Builder
Generate a daily feeding schedule with feeding times, meal sizes, and feed type recommendations based on species, fish size, water temperature, and production goals.
⏰ Feeding times🌡️ Temp-adjusted
Build schedule
🔬
Disease Symptom Checker
Select observed symptoms to identify likely disease candidates, probable causes, and recommended treatment approaches for common freshwater and marine fish diseases.
🐟 Freshwater💊 Treatment
Check symptoms
📅
Spawning & Breeding Calendar
Plan breeding cycles with species-specific spawning season data, temperature triggers, broodstock conditioning timelines, and incubation period estimates for your target harvest schedule.
🥚 Incubation📆 Season timing
View calendar
📋
Mortality & Survival Rate Tracker
Log daily mortalities and calculate cumulative survival rate, mortality rate, projected losses, and economic impact. Compare against species benchmarks to flag abnormal loss patterns.
📉 Survival rate💸 Economic loss
Track mortality
📚 For Educators & Researchers 7 tools

Visual and interactive resources for classroom teaching, independent research, and public science communication.

🌳
Visual Taxonomy Tree
Interactive collapsible tree of fish taxonomy: Class → Order → Family → Genus → Species. Browse the full classification hierarchy with species counts at every node.
🔎 Interactive🧬 Full hierarchy
Explore tree
🃏
Printable Species ID Cards
Printable identification cards for 500+ species showing scientific name, family, habitat, max size, and conservation status. Filter, select, preview, and print for field guides or classrooms.
🖨️ Print-ready500+ species
Browse cards
📝
Lesson Plan Templates
Ready-to-use lesson plan templates for ichthyology topics: fish taxonomy, anatomy, ecology, conservation, and aquaculture. Aligned to secondary and tertiary curriculum objectives.
🏫 Classroom📋 Templates
View templates
🐟
Anatomy Diagram Explorer
Interactive labelled fish anatomy diagram covering external morphology, fin types, sensory organs, and body regions. Hover to reveal function descriptions and teaching notes.
🏷️ Labels🎓 Teaching notes
Explore anatomy
🔄
Life Cycle Visualizer
Step-by-step visual life cycle diagrams for major fish groups: egg → larva → juvenile → adult → spawning. Includes duration estimates, developmental milestones, and survival rates per stage.
🥚 Egg to adult📊 Stage durations
View life cycles
🌊
Ecosystem Role Map
Visualise fish ecological roles - predator, prey, herbivore, detritivore, keystone species - within freshwater, marine, and estuarine ecosystems. Understand trophic relationships and food web positions.
🕸️ Food web🌿 Trophic levels
Explore roles
♻️
Conservation Status Explainer
Explore IUCN conservation status categories with species counts, real examples, and what each status means. Understand the difference between Least Concern, Vulnerable, Endangered, and Critically Endangered.
🔴 IUCN categories🐟 Live examples
Explore status
🧠 For Students & Self-Learners 6 tools

Interactive quizzes, comparison tools, and revision aids for ichthyology study and fish identification training.

🎯
Species Identification Quiz
Test your fish identification skills: guess the common name from scientific name, family, habitat, and size clues. 50 randomised species per session with instant feedback and a final score.
🎮 Interactive50 species🏆 Scored
Start quiz
🧬
Taxonomy Drill
Flashcard-style taxonomy practice: given a species name, identify the correct genus, family, order, or class. Randomised from 80 real species. Track your streak and score.
🃏 Flashcards🔁 Randomised
Start drill
📖
Glossary Quiz
Multiple-choice quiz on ichthyology and aquaculture vocabulary. Match terms to definitions, identify correct usage, and build your technical vocabulary for exams and fieldwork.
📚 Vocabulary✅ Multiple choice
Start quiz
📅
Fish of the Day
A new featured species every day - taxonomy, habitat, conservation status, size, diet, and fun facts. Bookmark to your study list or explore related species in the same family.
🗓️ Daily🌍 All habitats
View today's fish
📌
Study List
Save fish species to your personal study list for revision. Stored in your browser - no sign-up needed. Review key facts, quiz yourself on saved species, or export as a printable sheet.
💾 Browser-stored🖨️ Printable
Open study list
🔍
Species Comparison
Compare up to 4 fish species side-by-side on size, weight, habitat, conservation status, mercury level, diet, and more. Ideal for study notes, assignment research, or buying decisions.
↔️ Side-by-side4 species
Compare species