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Oyster Reef Ecosystem Tank

Discussion in 'Brackish' started by Chasmodes, Nov 14, 2016.

  1. Chasmodes

    Chasmodes AC Members

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    Last night, when I went to feed the fish, all of the blennies came out to feed aggressively except one of the males kept hiding in his shell. This is the blenny that I dubbed, "King", because at one time, he was king of the tank. He no longer is, as the other males caught up to him in size and can hold their own against him while defending their piece of the rock. "King", staying hidden and not eating reminded me of the behavior of the one that went blind, so I was quite concerned.

    After I finished dispersing the food, I decided to shine a light in the shell and see if he was OK or if I could find signs of disease. Just as I picked up the flashlight, he came out to feed, so I shined my light into the shell, and lo and behold, I found eggs. He was guarding eggs! This confirms my thoughts on a question that I had, that one female will breed with multiple males. I've seen two other males hiding out like this, the first was the one that I filmed guarding eggs a couple months ago. The second male blenny acted the same way, but I couldn't verify if he was guarding eggs or not, because his territory is in the back of the tank. This blenny was right in front. How convenient!

    So, I went upstairs to grab my phone, brought it down and set it up on my tripod and waited for him to leave his shell and catch a vid of him guarding the eggs and also a good shot of the eggs. It took about an hour, and he came out to fight off a rival male, and gave me the opportunity to get a shot.

    I have two videos, and I'll post the other one tomorrow. This is the second video that I shot, but it has a close up of the eggs, so I thought that I'd share it first. It also features what the other fish in the tank are up to. Hope you like it.
     
  2. Chasmodes

    Chasmodes AC Members

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    Here is the other video that I promised. I didn't have time to finish processing both of these yesterday:

     
  3. Chasmodes

    Chasmodes AC Members

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    The male blenny in the last video that I posted is still guarding the same eggs. At least, I think that they're the same eggs. So far, 10 days and they haven't hatched yet. I expect them to hatch very soon.

    Contrast this with skilletfish, who lay eggs about every four or five days. Their fry hatch that quickly. In addition, they will lay eggs even as the male skilletfish guards eggs from the last batch. I find that amazing.
     
  4. Chasmodes

    Chasmodes AC Members

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    I don't have much of an update, so I thought that I'd post another video update.
    Many of the fish are hunkered down in their oyster shells, guarding eggs, some out of sight. The hidden ones only come out to eat, then right back to their egg guarding duties. Toward the end of this video, two males encounter each other and look like they're about to fight, but both of them decided that it wasn't a good idea. Notice how dark the back of the head on the blenny to the left gets...that's an aggressive coloration.
     
  5. Chasmodes

    Chasmodes AC Members

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    Here's a video of one of my critters that rarely comes out...the black-fingered mud crab, Panopeus herbstii.

     
  6. Chasmodes

    Chasmodes AC Members

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    I went on vacation last week for about 10 days. I used an automatic feeder on the 20g long oyster reef tank with fish and fed them flakes. I must have opened up the door a little too much, because the glass was full of algae and the fish were fatter than fat! I had another feeder for my 20g high but it broke, so I asked the neighbors to feed that tank a pinch of flakes a couple times (crabs, anemones, shrimp, worms, barnacles, and mussels) while I was out. That tank also had a ton of algae on the glass. I'm sure both tanks received too much food, and the lights were on the entire time. I guess I need some timers for that. Anyway, all of the inhabitants of both tanks were just fine, and no disasters while I was out, so, life is good. Here is a video update of what the tank looked like last night after I cleaned the glass:
     
  7. Chasmodes

    Chasmodes AC Members

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    The skilletfish in the clam shell at the back of the tank seen in my previous video spawned again last night. He seems to guard a new batch of eggs about every three days. I don't know how many females are laying eggs in his shell. My hunch is that it is more than one because of the frequency that new eggs appear. I'm not sure how many male skilletfish that I have. I think one, because he is the only one that always hangs out in his shell. The others tend to roam the tank and use shells as they please without any one being a "home" shell. I assume the other three are females, but again, it is difficult for me to tell.

    The gobies have spawned a few times, but not in the last two weeks, that I have seen. If they have, then I can't see the eggs. All of the males hang out in their favorite shells but come out to feed. The lone female has a favorite shell too, much higher on the reef. I suspect that this is because the other males harass and flash her all of the time. I'm fairly certain that of my five gobies, that I have only one female. She is noticeably smaller than the rest of the gobies, and they're all the same age.

    Since there is only one female blenny, it's easier to see how often she spawns with any particular male, as long as I can see the oyster shell with eggs. The female is smaller than the males, and has a different coloration pattern, more mottled and camouflaged than the males. The males have bright blue spots, peach colored cheeks, and orange tinted tail, dorsal and anal fins..

    The male in the video below appears to occur about every week to ten days now. There could be spawning with the other males as well, one in particular, hides in a shell at the back of the tank, out of sight, so I don't know how often that has happened. The other male that I know has spawned prefers a shell toward the center of the tank, and she has spawned with him several times. There is a fourth male that has claimed four different shells, but has yet to settle on one, so I don't think he has spawned with her yet.

    This next video, shot two days ago, shows the largest male blenny in the tank courting a female. He flashes her a few times, then tries to herd her toward his shell to lay eggs. He is also guarding eggs from a previous spawn. I also noticed something interesting about this male. The males have a blue spot on the dorsal fin (you can see it if the light hits it right). In his case, he is developing a second spot! I haven't seen this before.
     

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