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Old 08-31-2007, 11:20 AM   #1
jgordie
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Cause of death for a starfish?


I woke up this morning to find my sandsifting starfish dead and missing a leg. What could be the culprit? I found my knobby starfish later eating the missing leg. Could it be the snowflake eel, niger trigger, mithrax crabs, or urchins? Or just bad luck? What are your thoughts?
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Old 08-31-2007, 12:11 PM   #2
tdwyatt
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how do you top off the tank for evaporative replacements?
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Old 08-31-2007, 12:15 PM   #3
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What size tank & how deep of sand bed? Also do you have a fudge.

He may be starving!
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Old 08-31-2007, 02:33 PM   #4
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Question the urchin first!!!
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Old 08-31-2007, 02:58 PM   #5
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how long have you had the starfish?

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Old 08-31-2007, 04:31 PM   #6
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ok...let's see if I can answer everyone's questions..I have a 125 gallon tank..I have a 2-3 inch sandbed, my tank has been up for 6 months,I have had the starfish since end of May...I top pff my tank using a tap chlorinator filter, and what the heck is a fudge?
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Old 08-31-2007, 05:22 PM   #7
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I top pff my tank using a tap chlorinator filter,
What is that? I wonder if your filter is malfunctioning and allowing chlorine or some heavy metal to get into the tank.
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Old 08-31-2007, 08:05 PM   #8
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how do you top off the tank for evaporative replacements?
Actually, the question posed by my comment relates to how you go about maintaining your salinity in your tank. These types of Asteroides have a system of hydraulics that allows them to move and adhere to objects in the marine environment using their "feet". It is known as the ambulacral system in these types of echinoderms, and unfortunately, it makes them extremely susceptible to changes in salinities in their environments. The combination of very thin semipermeable membranes and the use of osmotic pressures to locomote these creatures is the major issue with changes in salinities that may lead to rupturing of these membranes should there be constant fluctuations in the salinity. I have pix somewhere of a Linckia that has ruptured many membranes and begun to look like the internal tissue has exploded out of the seastar's body (I'll post sometime this weekend if I can find them). Although it appears that something has torn off the ray, in actuality, the seastar's ambulacral system has ruptured and the seastar loses rays and body parts as a result.

found 'em:







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Old 09-01-2007, 01:17 AM   #9
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What are your water parimeters?
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Old 09-01-2007, 09:49 AM   #10
jgordie
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Quote:
Originally Posted by tdwyatt View Post
Actually, the question posed by my comment relates to how you go about maintaining your salinity in your tank. These types of Asteroides have a system of hydraulics that allows them to move and adhere to objects in the marine environment using their "feet". It is known as the ambulacral system in these types of echinoderms, and unfortunately, it makes them extremely susceptible to changes in salinities in their environments. The combination of very thin semipermeable membranes and the use of osmotic pressures to locomote these creatures is the major issue with changes in salinities that may lead to rupturing of these membranes should there be constant fluctuations in the salinity. I have pix somewhere of a Linckia that has ruptured many membranes and begun to look like the internal tissue has exploded out of the seastar's body (I'll post sometime this weekend if I can find them). Although it appears that something has torn off the ray, in actuality, the seastar's ambulacral system has ruptured and the seastar loses rays and body parts as a result.

found 'em:






I only top off with freshwater..I don't use saltwater..My salinity maintains at 1.022..I have 2 other starfish in the tank who seem to be fine.
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Old 09-01-2007, 12:22 PM   #11
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OMG isin't that a blue linkia. and if so they are very sensitive to SG changes and should be in a very muchor tank. stars can lose limes if the water parameters are not up to spec. so dont juge any one just yet.
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Old 09-01-2007, 01:33 PM   #12
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Pix of the seastar if possible please, I'll explain more after the photos.

Just curious, how often do you top off the tank (how many times a day, and about how much water in what volume tank?)?
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