Aquatics retail is genuinely unique in ecommerce: it combines selling living creatures (fish, corals, invertebrates) alongside standard hardware and consumables. Live animal sales require completely different product data — water parameters, tank compatibility, feeding requirements, aggression levels — and a fundamentally different fulfilment model (live shipment with DOA guarantees, overnight delivery only). WooCommerce aquatics stores typically built around custom fields for livestock data. Shopify's metafields system handles this well, with careful planning needed for the live animal shipping flow.

Aquatics product categories

Tropical freshwater fish: Tetras, cichlids, guppies, discus — common livestock
Coldwater fish: Goldfish, koi, shubunkins — outdoor pond species
Marine fish: Clownfish, tangs, angelfish — saltwater species requiring marine setup
Corals: Soft corals, LPS (large polyp stony), SPS (small polyp stony) — reef keeping
Invertebrates: Shrimp, crabs, snails, sea urchins — tank cleaners and display animals
Live plants: Aquatic plants for freshwater tanks — Anubias, Java fern, stem plants
Aquariums and tanks: All-in-one aquariums, nano tanks, custom glass tanks
Filtration: Canister filters, hang-on-back filters, sump equipment
Lighting: LED lighting — PAR levels critical for coral growth
Food and supplements: Frozen food, flake, pellet, coral supplements
Water treatment: Dechlorinator, salt mix, bacteria, test kits

Livestock metafields (fish and invertebrates)

Water parameters

product.metafields.aquatic.ph_min (number_decimal) — minimum suitable pH (e.g., 6.5)
product.metafields.aquatic.ph_max (number_decimal) — maximum suitable pH (e.g., 7.5)
product.metafields.aquatic.temperature_min_c (number_integer) — minimum temperature in Celsius
product.metafields.aquatic.temperature_max_c (number_integer) — maximum temperature in Celsius
product.metafields.aquatic.hardness_dgh_range (single_line_text) — water hardness range (e.g., "2–10 dGH")
product.metafields.aquatic.salinity_sg (single_line_text) — specific gravity range for marine fish (e.g., "1.020–1.025")

Tank and compatibility

product.metafields.aquatic.min_tank_litres (number_integer) — minimum tank size in litres
product.metafields.aquatic.community_safe (boolean) — suitable for a community aquarium with other fish
product.metafields.aquatic.shrimp_safe (boolean) — won't eat shrimp
product.metafields.aquatic.plant_safe (boolean) — won't eat or destroy plants
product.metafields.aquatic.reef_safe (boolean) — for marine fish: safe in a reef tank with corals
product.metafields.aquatic.aggression_level (single_line_text) — "Peaceful", "Semi-aggressive", "Aggressive"
product.metafields.aquatic.max_adult_size_cm (number_decimal) — maximum adult size in cm
product.metafields.aquatic.care_level (single_line_text) — "Beginner", "Intermediate", "Expert"
product.metafields.aquatic.diet (single_line_text) — "Omnivore", "Carnivore", "Herbivore", "Planktivore"
product.metafields.aquatic.swimming_zone (single_line_text) — "Top", "Middle", "Bottom" — for planning tank layout

Coral metafields

product.metafields.coral.coral_type (single_line_text) — "Soft", "LPS", "SPS"
product.metafields.coral.light_requirement (single_line_text) — "Low", "Medium", "High", "Very High"
product.metafields.coral.par_range (single_line_text) — PAR units (e.g., "50–150 PAR" for soft corals)
product.metafields.coral.flow_requirement (single_line_text) — "Low", "Medium", "High", "Mixed"
product.metafields.coral.alk_demand (single_line_text) — "Low", "Medium", "High" — alkalinity consumption
product.metafields.coral.placement (single_line_text) — "Substrate", "Mid-tank", "High-placement" — where to place in tank
product.metafields.coral.frag_size_cm (number_decimal) — frag (fragment) size in cm
product.metafields.coral.mother_colony_available (boolean) — full colony available vs frags only

Live animal shipping

Shipping live animals is the most operationally complex aspect of aquatics ecommerce:

Overnight delivery only: Live fish must arrive within 24 hours. Use next-day or overnight courier services only (DHL Express, ParcelForce 24, TNT Overnite). Standard 3-day parcels are not suitable.
Weather holds: In extreme cold (below 0°C) or heat (above 30°C), live fish shipments should be held. Build weather hold policy into checkout — "We may hold shipments during extreme weather."
Day-specific despatch: Most aquatics retailers despatch live fish Monday–Wednesday to avoid weekend transit deaths. Configure Shopify shipping to offer live fish delivery only on specific days (Zapiet or custom shipping logic).
Packaging: Fish are packed in oxygen-sealed bags inside polystyrene-insulated boxes. Heat packs in winter. Packaging cost typically included in shipping price.
DOA (Dead On Arrival) guarantee: Standard in aquatics retail. If fish arrive dead, customer sends photo within 1 hour of delivery — replacement or refund issued. Include in product descriptions and a dedicated DOA policy page.
UK ban list: Some species are banned for sale in the UK (e.g., certain invasive species). Ensure compliance with the Wildlife and Countryside Act 1981 and invasive species regulations.

Aquarium equipment metafields

product.metafields.aquatic.tank_size_litres (single_line_text) — suitable tank volume (e.g., "60–200L")
product.metafields.aquatic.filter_flow_rate_lph (number_integer) — filter flow rate in litres per hour
product.metafields.aquatic.heater_wattage (number_integer) — heater wattage
product.metafields.aquatic.light_par_at_30cm (number_integer) — PAR output at 30cm depth for LED lights
product.metafields.aquatic.light_spectrum (single_line_text) — "Full spectrum", "Blue-dominant", "Planted spectrum"

Aquatics migration checklist

Create aquatic metafield namespace: ph_min/max, temperature_min/max_c, min_tank_litres, community_safe, shrimp_safe, reef_safe, aggression_level, max_adult_size_cm, care_level, swimming_zone
Create coral metafield namespace: coral_type, light_requirement, par_range, flow_requirement, alk_demand, frag_size_cm
Migrate WooCommerce livestock custom fields to Shopify metafields
Install Zapiet to configure day-specific live fish despatch (Mon–Wed only)
Write and publish DOA guarantee policy page — link from all livestock product pages
Add weather hold notice to livestock product pages
Set up overnight-only shipping rate for all livestock products
Configure livestock products separately from dry goods (different shipping requirements)
Create collections: Tropical Fish (beginner/intermediate/expert), Marine Fish, Corals (soft/LPS/SPS), Live Plants, Equipment
Enable compatibility filtering (shrimp-safe, reef-safe, care level) in Search & Discovery
Verify compliance with UK invasive species banned species list
Test: add live fish to cart → shipping shows overnight delivery only → day-specific despatch options shown

The DOA guarantee implementation is the most trust-critical element of an aquatics migration. WooCommerce aquatics stores often had the DOA policy buried in the Returns page — customers couldn't find it and assumed no guarantee existed, which suppressed conversion. The guarantee must be prominently displayed on every livestock product page (not just the policy page) and ideally shown with a badge or highlighted section: "Live Arrival Guarantee — full replacement or refund if fish don't arrive alive, with photo within 1 hour." The explicit 1-hour window for photo submission is essential — beyond that window it's difficult to verify the fish were dead on arrival vs stressed after arrival. Make both the guarantee and the time window clear on every product page.

Migrating an aquatics & fish keeping store from WooCommerce to Shopify (2026)