Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

Sue Daly / Koheru (Decapterus koheru) shoal swiming around diver, Cavalli Islands, New Zealand, February 2013. Model released.

Mark Carwardine / Mackerel scad (Decapterus macarellus) Guadalupe Island, Mexico (North Pacific)

Juergen Freund / Large catch of Mackerel scads (Decapterus macarellus) spread out to dry in the sun, Indonesia, August 2009

Juergen Freund / Large catch of Mackerel scads (Decapterus macarellus) spread out to dry in the sun, Indonesia, August 2009

Jeff Rotman / Great White shark (Carcharodon carcharias) swimming with symbiotic Pilot fish (Naucrates ductor) and schooling Mackerel scad (Decapterus macarellus) Guadalupe Island, Mexico, Pacific Ocean.

Pascal Kobeh / Yellowtail surgeonfish (Prionurus punctatus) grazing algae with a school of Amberstripe scads (Decapterus muroadsi) in background, Baja California peninsula, Mexico. Sea of Cortez.

Pascal Kobeh / Yellowtail surgeonfish (Prionurus punctatus) grazing algae with a school of jack mackerels (Trachurus symmetricus) Baja California peninsula, Mexico. Sea of Cortez.

Pascal Kobeh / School of Mackerel scads (Decapterus macarellus) swimming over a reef with Maldives anemonefish (Amphiprion nigripes) in Magnificent sea anemones (Heteractis magnifica) Maldives. Indian Ocean.

Pascal Kobeh / School of Mackerel scads (Decapterus macarellus) swimming over reef with Maldives anemonefish (Amphiprion nigripes) in Magnificent sea anemones (Heteractis magnifica) Maldives. Indian Ocean.

Sue Daly / Koheru (Decapterus koheru) shoal, Cavalli Islands, New Zealand, February