Housing Maintenance
"Maintenance of Ikelite Housings
Housing Assembly:
The general rule for all housings with multiple lid snaps is opposite snaps MUST be fastened simultaneously. Check that the cover is completely into the housing body with the 'O' ring touching everywhere before fastening the lid snaps. Most of our housings allow you to see that the 'O' ring is sealing as the snaps are fastened because the 'O' ring will show a blacker compression area around the entire face of the housing if properly sealed.
Housing 'O' Rings:
The port 'O' ring of our SLR housings will need a very slight film of lubricant to assure proper installation, but we recommend no lubricant on most of our housing 'O' rings. Please note that some lubricants may cause the Ikelite 'O' rings to soften and swell in size. A good quality silicone grease should be fine, or use genuine Ikelite lubricant to be sure.
The lubricant may be used to clean the 'O' rings, but most of it should then be wiped off. Be careful to not stretch the 'O' ring while pulling it between your fingers when cleaning.
Housing Controls:
Check the knob set screws occasionally to be sure they are tight, but do not over tighten. A very light film of lubricant should be placed on the shafts every few dives or every week of a vacation, then rotate the shaft while moving it in"
Housing Maintenance
Kristin Rasmussen at Cascadia Research Collective in Olympia, Washington, US, and colleagues photographed the tails of humpbacks wintering off the Caribbean coast of Costa Rica. From their individual tail patterns they identified seven of the same animals after they had returned to the Antarctic. One mother and calf made the 8300-kilometre (5160-mile) trip in 161 days.
Using satellite data, the team also recorded sea-surface temperatures for the sites where humpbacks spent the winter. “Wintering areas occur where waters with temperatures between 21°C and 28°C are found,” says Rasmussen. This supports the idea that the long migration saves the whales energy in the end.
Some researchers claim that the grey whale holds the record for longest mammalian migration – from Mexico to the Arctic, estimated at about 7600 km (4700 miles). “However, no individual grey whale has been documented travelling the full extent of their migratory range, and it's possible that no grey whales actually make the entire migration,” says Rasmussen. Only humpbacks have been documented making the full trip.
Rasmussen says that proposals to hunt humpbacks – such as Japan’s decision to catch 50 humpbacks each year as part of its “scientific” programme – makes it important to understand whale migration. “Whales don’t respect political boundaries,” she says. “Killing whales in one area could potentially impact their population half way around the world.”
Journal reference: Biology Letters (DOI: 10.1098/rsbl.2007.0067)