Posted 05 August 2005 - 02:09 PM
Posted 05 August 2005 - 03:21 PM
depends a bit on the difinition of `sleep'. "A period of rest and inactivity allowing the body to re-charge and recover from activity"????? Fish dont have eyelids as such so even when they rest it would be impossible to know if they were actually sleeping as we uderstand the term. Shark have nictating membranes which can cover the eyes but not actual eyelids. Some shark have been filmed in apparent sleep in caves and under rock ledges at which time they are totally inactive and can be approached without them moving. Other fish like the lungfish can bury itself in mud for many months during a dry season. Sleep or hibernation ? no idea. On coral reefs there appear to be day feeders and night feeders. At times when they are not in feeding mode the various species retire into safe areas, holes , ledges etc but again whilst they are difinately resting from activity the term sleeping as we know it may not apply.
Hope I aint confused the issue.
Posted 06 August 2005 - 12:44 AM
obviously some first hand information from your aquarium. Would be interested to hear more. Are there indications that they are actually sleeping (as we understand it) or just resting? Does this happen at any particular light phases, i.e. night /day/lights on/off?? Some more info on this type of thing could give indications as to why and when certain species feed at certain times. I`ve caught many common skate over the years but never had great success at night. 100-130+mtrs down there is certainly still a little light but often wondered does actual dark, i.e. night affect them or what???? Davy??? genuine question, not a dig, any ideas?????
Posted 06 August 2005 - 01:03 AM
Ok aquarium stuff first, most daylight species of fish certainly do "rest" at night, often taking a few minutes to come to when the light come back on. they also take a short time to settle down when the light's are switched off.
Stan, cant say I've noticed that, on the few times I've done night fishing for them I've still caught fish in the dark ok. I'm of the opinion that skate & rays just rest up for a few hours every now and again in between hunting/ feeding spells.
"Skate Anglers Have Bigger Tackle"
Posted 06 August 2005 - 01:15 AM
It might also explain why some neep tides don't fish too well.
We need a boffin to answer this one.
Posted 06 August 2005 - 02:54 AM
Posted 06 August 2005 - 03:31 AM
I wont finish the story as I am now a reformed character.
Posted 06 August 2005 - 03:57 AM
Experiments eventually proved that the mussels were responding to the moon. They could even detect it's presence when sealed in a metal container. Calculations showed that their actual feeding time remained exactly in step with the tide that would have occured had the desert been covered by ocean.
[ 05. August 2005, 10:58 PM: Message edited by: Slashley ]
Posted 06 August 2005 - 04:04 AM
Supporting ethical angling practices and wise use and conservation of fishery resources!
Getting confused by politics!
MY LIST IS LONGER THAN YOURS!