Yolk Sac

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0 height="100%"><tr> <td valign="top" width=200 BGCOLOR="#003333" TEXT="#F7F7FF" bgproperties="fixed" background="31d21253.gif"> <div> <IMG SRC="31ea08c0.gif" border=0 width="160" height="140" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <A HREF="id469.htm" TARGET="_top" TITLE="Acclimation"><U>Acclimation</U></A></div> <div> <A HREF="id470.htm" TARGET="_top" TITLE="Activated Carbon"><U>Activated Carbon</U></A></div> <div> <A HREF="id472.htm" TARGET="_top" TITLE="Aged Water"><U>Aged Water</U></A></div> <div> <A HREF="id473.htm" TARGET="_top" TITLE="Air Pump"><U>Air Pump</U></A></div> <div> <A HREF="id474.htm" TARGET="_top" TITLE="Airstone"><U>Airstone</U></A></div> <div> <A HREF="id480.htm" TARGET="_top" TITLE="Algae"><U>Algae</U></A></div> <div> <A HREF="id481.htm" TARGET="_top" TITLE="AlgaeEater"><U>Algae-Eater</U></A></div> <div> <A HREF="id482.htm" TARGET="_top" TITLE="Alkalinity"><U>Alkalinity</U></A></div> <div> <A HREF="id483.htm" TARGET="_top" TITLE="Anal fin"><U>Anal Fin</U></A></div> <div> <A HREF="id484.htm" TARGET="_top" TITLE="Anemone"><U>Anemone</U></A></div> <div> <A HREF="id485.htm" TARGET="_top" TITLE="Antenna"><U>Antenna</U></A></div> <div> <A HREF="id486.htm" TARGET="_top" TITLE="Antibiotic"><U>Antibiotic</U></A></div> <div> <A HREF="id487.htm" TARGET="_top" TITLE="AntiInflammatory"><U>Anti-Inflammatory</U></A></div> <div> <A HREF="id488.htm" TARGET="_top" TITLE="Anus"><U>Anus</U></A></div> <div> <A HREF="id489.htm" TARGET="_top" TITLE="Aquarium"><U>Aquarium</U></A></div> <div> <A HREF="id490.htm" TARGET="_top" TITLE="Asexual Reproduction"><U>Asexual Reproduction</U></A></div> <div> <A HREF="id300.htm" TARGET="_top" TITLE="Biological Filtration"><U>Biological Filtration</U></A></div> <div> <A HREF="id299.htm" TARGET="_top" TITLE="Chemical Filtration"><U>Chemical Filtration</U></A></div> <div> <A HREF="id143.htm" TARGET="_top" TITLE="Cycle"><U>Cycle</U></A></div> <div> <A HREF="id298.htm" TARGET="_top" TITLE="Mechanical Filtration"><U>Mechanical Filtration</U></A></div> <div> <A HREF="id147.htm" TARGET="_top" TITLE="New Tank Syndrome"><U>New Tank Syndrome</U></A></div> <div> <A HREF="id479.htm" TARGET="_top" TITLE="Trickle filter"><U>Trickle filter</U></A></div> <div> <A HREF="id478.htm" TARGET="_top" TITLE="Triggerfish"><U>Triggerfish</U></A></div> <div> <A HREF="id471.htm" TARGET="_top" TITLE="Tropical Fish"><U>Tropical Fish</U></A></div> <div> <A HREF="id477.htm" TARGET="_top" TITLE="Tubifex"><U>Tubifex</U></A></div> <div> <A HREF="id476.htm" TARGET="_top" TITLE="Wet/Dry Filter"><U>Wet/Dry Filter</U></A></div> <div> <A HREF="id475.htm" TARGET="_top" TITLE="Yolk Sac"><U>Yolk Sac</U></A></div> <bR> <bR> </td> <td valign="top" BGCOLOR="#FFFFFF" TEXT="#080000" bgproperties="fixed" background="15a40c83.jpg"> <div> <FONT SIZE="5" COLOR="#003333" FACE="Arial" ><B> </B></FONT>     |  <A HREF="index.htm" TARGET="_top" TITLE=" "><U>Home Page</U></A></div> <bR> <div> Yolk Sac</div> <div> <IMG SRC="16690140.jpg" border=0 width="400" height="20" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> A larval structure enclosing stored nutrients derived from the egg: In many fish it is retained for a period after hatching.</div> <div> <IMG SRC="16690140.jpg" border=0 width="400" height="20" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </td> </tr></table></body>