Caviar in Bags

Less than a week left to go here on Lizard. I've started to enjoy myself a lot more these past few weeks, partly because we simply stopped exhausting ourselves with work (cutting down from an average of 4 to 3 sessions in the water each day), and partly because I have reached that happy state of existence where I am very philosophic about my research: getting data is good, not getting data is not so good but not a good enough reason to fret myself awake at stupid times in the middle of the night. So anyway I hope to finish up with fieldwork in the next few days, leaving a few days for gear to dry out and be packed up, and all sorts of other exciting end-of-season work like taking our boat out of the water to waterblast all the slimy green stuff off it (we actually do this every few weeks, it's amazing how much difference it makes to the speed, no wonder all those boat guys in Malaysia are constantly hopping off the side and cleaning their boat from underwater while we're diving), and lots and lots of cleaning.

A week and a half ago had a Happy Scientific Moment. We were trying out this method which sometimes sounded to me totally implausible. Basically you wait for your fish to spawn with bated breath (well not really because one must Never Stop Breathing while on scuba, for fear of a very painful condition known as a burst lung or two). If they are being cooperative, which is only about 50% of the time currently, the male and the female will swim upwards together then simultaneously release eggs and sperm in a little cloud in the water column. You then rush towards the area where they have spawned with this gigantic plastic bag and you surround the entire gamete cloud with your bag. Then you bring it to the boat and try to figure out how on earth you are meant to lift 33 litres of water in a plastic bag onto your boat; then you subsample your bag; then back in the lab you filter your subsample several times and count eggs and sperm. I couldn't get any sperm, possibly because my methods weren't quite correct and also I had no clue what fish sperm actually look like (I had never before seen this done in my life and was simply following the descriptions in papers); but I did unbelievably get some eggs despite the total mess we'd made of the whole thing, and staring down the microscope I found that they were mostly actually fertilized. It really makes very simple logical sense but for a while it gobsmacked me that you could do this at all; that you could take a big plastic bag and collect gametes with it and subsample and filter and stain and stick in a petri dish and look at under a microscope and COUNT fertilised egg ratios. I suppose it is only because I am a whole animal biologist that I find it amazing, because most of the time I do things that any child could do, counting the number of bites a fish takes or following it around, so anything that involves a slightly more complicated procedure (and things that require a microscope!) seems incredibly sophisticated. But anyway, it worked. Once. We've only been able to do it again once more, due to the fish being uncooperative, and that time it failed utterly with no eggs at all. I'm hoping to repeat it successfully just once more before the season is out, just to prove it wasn't some kind of weird fluke, as the aim really was just to pilot the method for use in the next season. But it might require underwater Barry White broadcasts, as one of the other researchers suggested.

When we are not waiting for fish to get it on we somethimes find time to go on little excursions.

On the way up to Cook's Look, the highest point on the island:



Finally made it!



Another trip to Coconut Beach round the other side of the island, totally deserted with no sign of human habitation...



...except for the fact that the seagulls will come and sit next to you when you are having lunch.