Scientists at Pennsylvania State University and the University of California, Santa Barbara have discovered that when fishermen selectively catch large and medium-sized parrotfish at coral reefs facing decline due to climate change, algae has a better chance of growing and overtaking the corals.

Nonetheless, according to the research, the reef’s biomass is maintained. This is because even with less of the large and medium-sized parrotfish, there would be many smaller parrotfish that would take their place.

The Chinese government has imposed a 10-year commercial fishing ban in the Yangtze River to combat "across-the-board" declines in the populations of rare species like the Chinese sturgeon.

As it came into effect on 1 January 2020, it is hoped that the ban will tackle the problems of dwindling fish stocks and declining biodiversity in the 6,300m river. It will be applied at 332 conservation sites along the river and be extended to cover the main river course and key tributaries by 1 January 2021.

The Australian authors—Dr Neil Banham (lead) and Dr John Lippmann—reported that a 26-year-old healthy male freediver dived to 10m (32.8ft) where he met a friend who was diving on scuba. The freediver breathed from a scuba regulator before ascending.

It may have been that he held much of his breath during ascent, which would have been his usual and generally safe practice with normal breath hold diving. — Banham, Lippmann