The eggs are fine Jean, although they do have a thick algal layer on them (I had them in the tank with the eggs on the upper surface of the rock slabs, instead of the under (the way they were collected)); I did it to ensure good circulation - it only effects the outermost capsule.
They're in a tank that might fluctuate 21-24°C, which is probably a darn-sight warmer than what you're circulating through yours. Last Thursday we sacrificed an embryo just to make sure that they were viable - it was ~ 40% embryo/60% egg yolk, with developing eyes and chromatophores, so they're quite ok.
I actually took a clump down to Kerry at the National Aquarium of NZ (Napier) on Friday - a whirlwind tour to collect something else - so we've got two bunches here and he has one there. Best not to have all eggs in one basket. You do have a copy of Hurst's project on these animals don't you? If not I can run a copy off (it is University of Otago anyway).
Have just returned from the Waitakere's, following a hunt for West Coast mysids (East Coast sources have dried up). After looking at many different locals I stumbled on a bonanza site - squirted a ton of O2 into the containers and whipped back with a trillion. We have thousands of starving baby octopus and broad squid, not to mention a ton of fish down at Kelly's that haven't fed for .... (I'll not say how long).
Will actually post a new thread in the conservation forum, given loss of maritime vegetation and excessive coastal siltation on the East Coast results in grossly elevated estuarine water temperatures, and lack of organic input (foliage), partly responsible for summer loss of mysids. Must be a collapse through the food chain. Have been taking pics of mysid habitat all this week (have been everywhere - Kawhia, Napier, Auckland East and West Coast, and have just located them; there are squillions in Napier, but I don't fancy the 11 hour, 1-day return drive too often, and we need those for the culture stock).
You get a ton of euphasiids coming into the harbour, but do you get mysids? Have you extensive Junctus grasses flanking the estuary down there? Should be a good place to look; great food for the wee Sepioloidea (I'd opt for this rather than amphipods)!