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This is how giants do

By Leonard Ho - Posted Jan 23, 2015 08:00 AM
Goliath groupers are massive fish that can grow nearly 2.5 meters in length (8 feet) and weigh almost half a ton (450kg). Last summer, scientists documented for the first time how these rare giants spawn.

As noted in the short paper published in Coral Reefs:

On 10 August 2014 (full moon day, 0915 hrs, 25 m depth), a light color phase E. itajara released a sperm cloud (Fig. 1a, b). On 16 August 2014 (1430 hrs, 25 m depth), a different light color phase E. itajara released an egg cloud (Fig. 1c). Neither group spawning nor synchronized male–female spawning was observed.

The scientists posit that the light color phase of Goliath Groupers (Epinephelus itajara) may be an indicator that the fish is ready to spawn.  Many fish change colors to signal they're ready to reproduce and now scientists and conservation groups may know what to look for when evaluating these critically endangered groupers.

grouperspawn2.jpg

Author: Leonard Ho
Location: Southern California

I'm a passionate aquarist of over 30 years, a coral reef lover, and the blog editor for Advanced Aquarist. While aquarium gadgets interest me, it's really livestock (especially fish), artistry of aquariums, and "method behind the madness" processes that captivate my attention.

Website: http://www.advancedaquarist.com.

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