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Neon Gobies (Elacatinus oceanops) Again!

Posted on April 27, 2013 at 10:05 PM

3/26/2013

Yesterday I moved the goby nest in its PVC pipe home to the BRT.   I moved them a day early, because I was concerned that I might miss the hatch. So I moved them, and waited, and none appeared to hatch. Came home from work today, and looked for goby larvae. Still no hatch.

Gave up and thought I would clean out the BRT, since it could be used for something else. Then I noticed a tiny goby larva in there! I found the flashlight and discovered a few more.   I took the nest pipe and looked at it. There seemed to be fewer eggs there than I remembered. I gave a good Mulcahey underwater shake, waited for a hatch and still nothing. I reattached it to the air bubble stream. 15 minutes later, I came back and noticed one in the water . And what? There's another crowd of larvae over there!!! They were hatching!  In broad daylight!  It was a good hatch. The larvae seem strong, and are eating the rotifers.  After consulting with friend Jim, his gobies hatch in daylight regularly. Huh.

Gobies 4/7/13

I have a black round 17 gallon tub with baby goby larvae in it. I started this tub 12 days ago with a fresh hatch of Neon Gobies (Elacatinus oceanops).  They did alright with just SS rotifers for a few days. I noticed the tub had a lawn of green fuzz on its underwater surface, so I thought it might be time for a sponge filter. I retrieved the pond sponge that has been living in my growout sump forever, put it in a bucket, and hooked up a small powerhead with a T'd off valve to send water back into the bucket, and tubing on the T leading over the edge of the tub. The tub has a central standpipe that drains to the bucket. The valve is so I can control the flow, but it didn't work too well, as I either got too much flow or nothing at all. I started this slow exchange of water for about 4 days, and my goby population dwindled to just a couple .

The next nest of gobies were hatched in the tub, without changing a thing except to turn off the flow. Two days later, there still appeared to be a lot of baby gobies and at least one that is much longer, and I assume is a holdout from the previous nest. I am always happy to see him, Mr. Long, as it will be reassuring to have at least one metamorphosize before the rest of them, in 4 weeks time.

This morning I was re-reading a friend's report, and was reminded that gobies don't like to have water changes. They must be very delicate. Maybe that's why I lost so many when I started the circulation with the pond filter. I'll have to try something different  with this batch. I am toping off with fresh water by adding a half of a cup whenever I pass by. The tank is lit 24/7 with a clamp-on reflector fixture and an 18 watt CFL. The majority of the larvae are in a cloud under the lamp, so I think they like the light. Some are on the other side of the tub, in a low flow area. Now at Day 2, the larvae are on the last bits of yolk sac. I expect that the ones who have not learned to eat the tiny rotifers will die off, and it is not unusual to have mortalities on Day 3.

4/27/2012

It's hard to say what one's yield is, when the gobies start out as transparent as glass, and the size of a baby's eyelash, and impossible to count.  Making it even more difficult is that they are in a black round tub, swimming in a soup of green phytoplankton and rotifers.  One can hardly see them without the aid of a strong pair of glasses, and a flashlight when they first hatch.  But I have to say, it appears that there were not really significant mortalities more than three weeks later.  The cloud of larvae are still a cloud, perhaps as many as 20 little darters, still eating constantly 22 days after hatching, without sleep.  They are beginning to show signs of metamorphosis! 

About a week ago I slipped a 3/4 inch PVC elbow into the tub, to provide some perching space for the settled gobies.  One little guy took up residence almost immediately, and while I can't see him clearly, and he never comes to the surface, I am now sure it is Mr. Long.  This goby is completely dark, and has well developed pectoral and caudal fins.  I can't see the neon blue stripes, and I can't get a picture, but it has to be him.  I am reassured that he alone survived from the first nest, and it makes me feel that I did as well as can be expected for the rest of them.






Categories: Neon Gobies, Recalculating...

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