A Cape Cod company is now launching a timer that might help save dwindling populations of sea turtles from being decimated by fishing nets.

The new device is a 7-inch (18 cm) long silver cylinder capable of keeping track of how long a net has been submerged. Federal research indicates that a vast majority of entangled sea turtles will survive if they are rescued and given a chance to breath within 50 minutes.

Green sea turtle –Chelonia mydas : Picture by Mila Zinkova

As soon as the device reaches a depth of at least two metres, it will start recording water depth every 30 seconds and it will also make note of any time-limit breaches. Since the honour system might not be enough, the timer has been built to save its data for later download by marine authorities.

Fishermen using the timer will not only help save the sea turtles; they may also be able to save themselves from more onerous regulations, such as no-fishing zones. The timer is naturally not a one-size fits all fix-all to the problem with turtles being drowned in fishing nets, but it might prove useful for certain types of nets in certain conditions.

The logger was built under a $25,000 federal contract with the National Oceanic and Atmospheric Administration by Onset Computer Corp., a Bourne-based supplier of data loggers for energy and environmental monitoring.

Researchers at Woods Hole Oceanographic Institution (WHOI) unveiled a hazardous cocktail of pesticides when analysing the brain matter of 12 marine mammals; eleven cetaceans and one gray seal stranded near Cape Cod, Massachusetts.

This is the most extensive study of pollutants in marine mammals’ brains and it confirms suspicions of marine mammals being the carrier of a vast array of different chemicals that have found their way into marine ecosystems.

Lead author Eric Montie analyzed the cerebrospinal fluid and the gray matter of the cerebellum in the twelve animals and found them to contain a long row of different man-made chemicals, including a group of especially widespread substances labelled “the dirty dozen” by environmentalists. Many countries banned the “the dirty dozen” as early as the 1970s due to their adverse effect on human health, but they are unfortunately still present in our environment.

Montie didn’t just test for the presence of certain chemicals; he also measured their concentration and found one instance where it was surprisingly high.

“The biggest wakeup was that we found parts per million concentrations of hydroxylated PCBs in the cerebrospinal fluid of a gray seal”, says Montie. “That is so worrisome for me. You rarely find parts per million levels of anything in the brain.”

PCBs are neurotoxicants known to disrupt the thyroid hormone system. Other examples chemicals found in the tested mammals are DDT (diklorodifenyltriklorethane), which can cause cancer and disturb reproduction, and PBDEs (polybrominated diphenyl ethers); a type of flame retardants known to impair the development of motor activity and cognition.

Co-author Chris Reddy, a senior scientist in the WHOI Marine Chemistry and Geochemistry Department, describes the new study as “groundbreaking because Eric measures a variety of different chemicals in animal tissues that had not been previously explored. It gives us greater insight into how these chemicals may behave in marine mammals.”

The results of this study was published online April 17 in Environmental Pollution.