Suzi Eszterhas / Two Purple / Striped Jellyfish (Pelegia / Chrysaora colorata) Monterey Bay Aquarium, California, USA, Captive

DOC WHITE / Boy and girl watch Beluga whale {Delphinapterus leucas} at Mystic Aquarium, Connecticut, USA. Model released White whales

Alex Mustard / 2020VISION / A pair of captive Common / Short snouted seahorses (Hippocampus hippocampus) in aquarium, Weymouth Sealife Centre, Dorset, England, UK.

Stephen Dalton / Red tailed black shark (Labeo / Epalzeorhynchos bicolor) pair in aquarium, extinct in wild

Stephen Dalton / Pearl gourami (Trichogaster leeri) controlled conditions

GEORGETTE DOUWMA / White's / Golden seahorse (Hippocampus whitei). captive, Sydney Aquarium, New South Wales, Australia.

Doug Perrine / False killer whales ( Pseudorca crassidens) captive, aquarium, from Indo-pacific, digitally manipulated

GEORGETTE DOUWMA / Two White's seahorse {Hippocampus whitei} tails entwined, captive, Sydney Aquarium, New South Wales, Australia.

Jabruson / Girl watching Sand tiger shark in Two oceans aquarium, Cape Town, South Africa

DOC WHITE / Boy and girl watch Beluga whales {Delphinapterus leucas} at Mystic Aquarium, Connecticut, USA. Model released

Jabruson / Loggerhead turtle Sand tiger shark in Two oceans aquarium Cape Town South Africa