The Weekly Dive, Vol. 11
Dive into the latest edition of The Weekly Dive, where we bring you the big ocean news - along with the video update!
Whale populations swim to the beat of their own drum. Though it was previously thought that whales in the same ocean basin sing similar songs, a new study found that the songs of humpback whales on the east and west sides of the Indian Ocean are unique to that group – demonstrating the complexity of whale social interactions and culture. [The Washington Post]
Post-9/11 data links ship noise to whale stress. Something happened in the wake of 9/11: shipping traffic was dramatically reduced, and stress hormones in right whales dropped. Sound pollution has been known to cause adverse behavioral responses in whales and dolphins, but this study provides the first physiological evidence. [Science Daily]
California kicks sewage to deeper water. The U.S. Environmental Protection Agency now requires vessels over 300-tons to go at least 3 miles offshore before dumping their treated and untreated sewage. The move is expected to prevent more than 20 million gallons of sewage, largely form cruise ships, from entering the zone within 3 miles of land. [The Los Angeles Times; The Huffington Post]
Tuna drop by 60% in 50 years. New research confirms the decimation of tuna populations, particularly bluefin, which has fallen by 80%. Mackerel is also significantly depleted, demonstrating that even small species – commonly perceived to be more resilient to overfishing – are also vulnerable without better management. [Science Daily]
Managing salmon stocks more complicated than it appears. A recent study found that salmon raised in hatcheries are masking the drop in wild salmon populations in northern California. This follows another recent study that found hatchery-raised fish are genetically selected to be more fit for hatchery living, and less fit for the wild than their wild counterparts. [The New York Times; Science Daily]
Big-box going blue. A growing list of big-box stores and major grocery chains are making commitments to selling sustainable seafood. Safeway recently said it will responsibly source its canned skipjack tuna, while Australian chain Coles said they will phase out all unsustainable species by 2015. [NPR; Marketwatch; Adelaide Now]
The Great White Shark Song is here to say “If I was a great white, I wouldn’t bite you.”
And for this week’s video Dive: Whale you be my Valentine?