The Starfish of Hong Kong, Part 2

Blue Linckia (Linckia laevigata)

Blue Linckia via WikiCommons cc-by-sa 3.0

Ranges in color morphs from dark or light blue, but also observed as aqua, purple, or even orange variations throughout the ocean. Grows up to 30 cm in diameter and has rounded arm tips. Some individuals can have lighter or darker spots along their arms. They are typically firm in texture and have slightly tubular arms with short, yellowish tube feet on the underside. It inhabits coral reefs and sea grass beds. They occur subtidally, sometimes intertidally, on fine sand or hard surfaces and move quite slowly .

Cushioning Star (Culcita nouvaeguineae)

via WikiCommons (Shizhao, cc-by-sa-2.5)

The cushion star has very short arms and an inflated appearance, resembling a pentagonal pincushion. Its colour is variable and it occurs in tropical warm waters in the Indo-Pacific. It ranges from Madagascar and the Seychelles to the Philippines, New Guinea, Australia and Hawaii.  It feeds on detritus and small invertebrates, including stony corals.

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Toxic Algae and Man-Sized Jellyfish

Once a swampy backwater of fewer than 20 million people, the Pearl River Delta—the southern swath of mainland China above Hong Kong—now has three times that population. Tens of millions more humans in the Pearl River Delta means many more toilets a-flush, pumping a steady gush of human waste into the South China Sea.
Read the full story at Quartz