‘Jet packs’ and ultrasounds could reveal secrets of pregnant whale sharks

Underwater ultrasounds and blood tests could help scientists learn more about whale shark reproduction.

are relatively rare, their reproductive biology is mostly a mystery . Nearly everything biologists think they know is based on the examination of one pregnant female caught by a commercial fishing boat in 1995.

Then the researchers had to maneuver a 17-kilogram briefcase containing a waterproof ultrasound wand on the undersides of 22 females swimming near the Galápagos Islands and draw blood with syringes from their fins. Until this study, the ultrasound wand had never been used outside of an aquarium on free-swimming wildlife.

Ultrasound imagery showed egg follicles in two of the 22 female sharks, meaning those females were mature enough to reproduce but not pregnant. The biologists did not locate a pregnant whale shark.

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