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Egg Retention (Dystocia) in Turtles – the Problem and Some Solutions – Part 1

One of the most common and serious problems faced by turtle keepers involves female turtles (mated or unmated) that develop eggs but refuse to deposit them in the terrariums or aquariums in which they live.  While this can be the result of any number of health problems (i.e. low calcium levels, tumors), the lack of an appropriate nesting site is more often than not the cause.

Retained Eggs

It’s very difficult to keep turtles, especially semi-aquatic and aquatic species, in an enclosure that allows for year-round access to a nesting site.  Providing a terrestrial nesting site, as well as adequate swimming space, usually involves the use of a pool or pond as opposed to an aquarium. 

Gravid females without access to a nesting site usually become very restless and may deposit their eggs in the water.  This is not, however, a safe strategy, as such females wait for a long time before expelling their eggs, and may not deposit the entire clutch.  Retained eggs may become over-calcified and difficult to pass, or they may break within the female’s body and cause an infection (egg yolk peritonitis) that is invariably fatal if not treated early-on.

Nesting Preferences

Snapping Turtle Laying EggsIn order to provide your turtles with acceptable nesting sites, it is essential that you are familiar with both the species’ natural history and the individual turtle.  In this way, you will be able to provide the site at the correct time of year and manipulate other factors (i.e. temperature) appropriately.

The substrate and location of the site provided is also important – a soil/sand mix is acceptable to many turtles, but some (Batagur baska, most softshells) prefer sand while others (Black-Breasted Leaf Turtles, Geoemyda spengleri) often choose to lay alongside a log or other structure.  During my Bronx Zoo years, I spoke with several colleagues (at different zoos) who observed gravid Giant Musk Turtles (Staurotypus triporcatus) to consistently choose elevated nesting sites.

 

Further Reading

Please see this article on Snapping Turtle Reproduction for further information on the breeding habits of this most prolific turtle.

Video of a Snapping Turtle digging a nest and laying eggs.

Snapping turtle laying eggs image referenced from wikipedia and originally posted by Moondigger

2 comments

  1. avatar

    Thank you so much for your information! We have 2 RES-one male and one female. We have a large outdoor pond with surrounding nesting area that is fenced and safe. Unfortunately, Sunshine seems to want to lay eggs now. We live in Oklahoma and have crazy weather so we usually wait until May or June to move the turtles back outside to their outdoor habitat. In the late fall we move them inside to a 60 gal aquarium and we have a sunning platform with a light. We have made a nesting area out of a tub, but I’m concerned it isn’t large enough. Would it be better to go ahead and move her outside-temps may be 80 one day and 40 the next, make a nesting area out of a kiddie pool outside and move her in and out depending on the temp, or keep trying the tub? We will also see if we can find a vet that treats turtles here. Our guinea pig vet may, so we’ll check with her. Any advice is appreciated!
    Jennifer

    • avatar

      Hi jennifer,

      Thanks for the kind words.

      They often lay out of season….influence of captive light cycles and other factors. A kiddie pool sounds like best option…plenty of space etc. I would not leave outdoors permanently yet, easy to contract a respiratory infection after sudden period of low temps.

      The link below lists 2 turtle experienced vets in OK; ask for a reference from them if neither is close. Your regular vet may be able to administer oxytosin if turtle does not deposit eggs, procedure is well known, straight forward. Please keep me posted, frank
      http://www.nytts.org/nytts/helpnet.htm#OK

About Frank Indiviglio

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Being born with a deep interest in animals might seem unfortunate for a native Bronxite , but my family encouraged my interest and the menagerie that sprung from it. Jobs with pet stores and importers had me caring for a fantastic assortment of reptiles and amphibians. After a detour as a lawyer, I was hired as a Bronx Zoo animal keeper and was soon caring for gharials, goliath frogs, king cobras and everything in-between. Research has taken me in pursuit of anacondas, Orinoco crocodiles and other animals in locales ranging from Venezuela’s llanos to Tortuguero’s beaches. Now, after 20+ years with the Bronx Zoo, I am a consultant for several zoos and museums. I have spent time in Japan, and often exchange ideas with zoologists there. I have written books on salamanders, geckos and other “herps”, discussed reptile-keeping on television and presented papers at conferences. A Master’s Degree in biology has led to teaching opportunities. My work puts me in contact with thousands of hobbyists keeping an array of pets. Without fail, I have learned much from them and hope, dear readers, that you will be generous in sharing your thoughts on this blog and web site. For a complete biography of my experience click here.
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