An ichthyologist studying coral reefs observes that a certain reef supports 480 fish, with species A making up 35% of the population, species B 40%, and the rest species C. Due to warming waters, species A declines by 25%, species B by 15%, and species C increases by 10% over a year. What is the new total fish population after one year?

Wed, 22 Apr 2026 09:22:13 +0000

**The shifting balance of life on Great Barrier Reef reefs: what changes happen when warming waters reshape fish populations?** What’s happening beneath the waves of a reef that supports 480 fish, where species A thrive at 35% of the total, species B at 40%, and the remainder species C? Recent data reveals a quiet but meaningful shift—warming ocean temperatures are altering the reef’s delicate ecosystem. An ichthyologist studying this reef notes these precise changes: species A drops 25%, species B declines 15%, while species C rises 10% over just one year. Curious readers are seeking clarity: what’s the new total — and what does this mean for reef health? The answer reveals not just numbers, but a telling indicator of climate’s impact on marine biodiversity across the U.S. coral reef regions and beyond. --- ### Why This Reef’s Numbers Matter in the Climate Conversation