Select Aquatics of Erie CO.
 
                            The Goodeids
        Ameca splendens, Characodon lateralis, Ilyodon furcidens, Xenotoca eiseni,
         S. multipunctata and Zoogoneticus tequila are the Goodeids currently 
                                      being worked with at Select Aquatics.
 


   
The Goodeids are a very different type of fish, and can be recognized by generally possessing a
    few similar, distinguishable body shapes. Many of the species in this family are threatened or near
    extinction within the central high plains of Mexico, and their method of reproduction is of particular
    interest. A compilation of the Goodeids and their conservation status, as published by
    Dr. John Lyons is here.

    Unlike the reproduction of the swordtails, mollies, guppies and platies, Goodeid reproduction is
    viviparous- more like our own. Similar to the other livebearers, they have internal fertilization, but
    instead of a gonopodium like guppies and swordtails, the male possesses a fin adaptation called
    an andropodium. This "notch" in the anal fin can be seen in the top pic of the male Ilyodon furcidens,
    just forward of the ventral fin. Click here for an enlarged image.

    The young develop while being directly nourished by the mother before they are born, unlike other
    livebearers. Similar to an umbilical cord in mammals, the goodeid structure, the trophotaenia,
    nourishes each fry during its development, falling off shortly after birth.

    Generally unknown in the commercial tropical fish hobby, they are some of the most interesting 
    and attractive fish that can be kept in the home aquarium. Most are peaceful with one another,
    and generally good community fish, though adult Ilyodon furcidens can take care of themselves
    when picked upon.

    The newborn fry are much larger than the young of other livebearers, but the number of young within
    each drop is smaller. Unfortunately, some, such as the Z. tequila will still eat their fry, while other
    species may not. My largest drop from a goodeid was from the female Skiffia multipunctata
    pictured at left who dropped 19 fry. Generally expect 10-15, and a  female's first brood is usually
    5-10. They do not require any special requirements, preferring planted tanks, and do best with
    temperatures in the low to mid 70ís. They do not tolerate warmer temperatures for extended
    periods. (Above 78-80).

    After 3 years of making an effort to maintain large numbers of them here, some species
    do not reproduce quickly enough or in large enough numbers to meet demand, and must
    be pulled occasionally to allow their numbers to build back up. The S. multipunctata and
    C. lateralis- two of the most attractive, are examples of this. A recent broad restructuring
    of the fishroom- the introduction of hydroponics fans and firm fitting tops on all of the
    aquariums to hold down on moisture production, and to better stabilize tank temperatures,
    for example, caused an overall warming that those two species did not respond well to. The
    Z. tequila and I. furcidens, interestingly, reproduce very well and the slight change in
    temperature did not affect them at all.

   Further complicating matters, many goodeid species- again the C. lateralis and 
   S. multipunctata come to mind,  tend to breed seasonally, and will cease reproduction from 
   approximately October through April.

   For each species there is a Care Guide providing more information, addressing the problems
   some fishkeepers encounter, specific to each species. The Care Guides can be seen by
   clicking Here.


   Pictured at left: Top- Male Ilyodon furcidens,
   2nd from top- Characodon lateralis
   3rd from top- Gravid Goodeid (S. multipunctata)
   Bottom pic- Pair Zoogoneticus tequila

 

 

 

 

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