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.2015 Sep 25;10(9):e0139053.
doi: 10.1371/journal.pone.0139053. eCollection 2015.

Modeling Commercial Freshwater Turtle Production on US Farms for Pet and Meat Markets

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Modeling Commercial Freshwater Turtle Production on US Farms for Pet and Meat Markets

Ivana Mali et al. PLoS One..

Abstract

Freshwater turtles are being exploited for meat, eggs, traditional medicine, and pet trade. As a response, turtle farming became a booming aquaculture industry in the past two decades, specifically in the southeastern states of the United States of America (US) and across Southeast Asia. However, US turtle farms are currently producing turtles only for the pet trade while commercial trappers remain focused on catching the largest individuals from the wild. In our analyses we have created a biological and economic model that describes farming operations on a representative turtle farm in Louisiana. We first modeled current production of hatchling and yearling red-eared slider turtles (Trachemys scripta elegans) (i.e., traditional farming) for foreign and domestic pet markets, respectively. We tested the possibility of harvesting adult turtles from the breeding stock for sale to meat markets to enable alternative markets for the farmers, while decreasing the continued pressures on wild populations (i.e., non-traditional farming). Our economic model required current profit requirements of ~$13/turtle or ~$20.31/kg of meat from non-traditional farming in order to acquire the same profit as traditional farming, a value which currently exceeds market values of red-eared sliders. However, increasing competition with Asian turtle farms and decreasing hatchling prices may force the shift in the US toward producing turtles for meat markets. In addition, our model can be modified and applied to more desirable species on the meat market once more knowledge is acquired about species life histories and space requirements under farmed conditions.

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Conflict of interest statement

Competing Interests:The authors have declared that no competing interests exist.

Figures

Fig 1
Fig 1. Annual production of turtles on Louisiana turtle farms from 2004–2013 reported by turtle farms to the Louisiana Department of Agriculture.
Fig 2
Fig 2. Conceptual diagram of the freshwater turtle farming operations (non-stochastic model). The model was developed for male and female portion of the population. Broken vertical lines separate the operations into egg incubation in closed facilities (Incubator), raising hatchlings to 4 inch turtles or for head-starting in green-house ponds (Green-house), and maintenance of turtles in the outdoor artificial stock ponds (Stock pond).
In the model, survival (s), hatchling transfer to the green-house ponds (F0 and M0), and head-start transfer to the stock pond (gF and gm) are illustrated by arrows (material transfers) entering. Mortality (mY and mA) and harvest (H, hF1, hM1, hA) by arrows (material transfers) leaving. Squares (state variables) represent number of males and females of each age class (F1–F6 and M1–F5) and the total numbers of yearlings and adults sold over time (YF, YM, AF, AM). Hatchlings are sold the same year that eggs are laid and the number of hatchlings sold annually is represented by H (circle).
Fig 3
Fig 3. Farming production under different harvest pressures of the adults from the stock, assuming constant production of ~55,000 four inch turtles for domestic markets.
As the adult harvest rates increases, the hatchling production gradually decreases.
Fig 4
Fig 4. Annual profit from traditional farming operations, assuming discount rate (d) of 5% and a range of market rates (m) from 1–9%.
Fig 5
Fig 5. Porter five forces analysis diagram representing underlying drivers of freshwater turtle industry such as the market competition, buyer and supplier power, and threats of substitute products.
See this image and copyright information in PMC

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