Lesions Observed Post Mortem in Post-hatchling Loggerhead Sea Turtles (Caretta caretta) from a Head Start Programme.

Head start programmes are ex-situ conservation procedures consisting of the captive rearing of sea turtle hatchlings for several months in order to avoid high mortality rates in the first year of life. Studies of the diseases of hatchling and post-hatchling turtles belonging to these programmes are scarce. We describe the gross and histological lesions found in 78 post-hatchling loggerhead sea turtles (Caretta caretta) that died during captive rearing in the conservation programme of the Cape Verde-Canary Islands, initiated with 113 hatchlings. The main organ systems affected were respiratory (57.69%), integumentary (41.02%) and digestive (41.02%), affecting 94.87% of the animals. Other less frequently affected organ systems were cardiovascular (3.85%), excretory (3.85%), muscular (2.56%) and reproductive (1.28%). The most common lesions were different types of dermatitis (41.02%), mainly ulcerative and/or heterophilic ulcerative dermatitis; these lesions were compatible with a traumatic origin caused by biting and subsequent infection with gram-positive cocci. Purulent and/or fibrinonecrotizing rhinitis associated with mixed populations of bacteria were commonly detected respiratory lesions (21.79%). Acute interstitial pneumonia was the most common form of pneumonia diagnosed (20.51%). Fibrinonecrotizing stomatitis associated with sparse gram-negative rods was the most common digestive tract lesion (29.49%). A possible explanation for the high mortality rate (88.50%) observed in this study could be the occurrence of a decrease in water temperature during the growth phase of the turtles. Despite the limitations caused by an absence of microbiological studies, the survey provides useful information on the lesions found in post-hatchling loggerhead turtles from this head start programme. In addition to maintaining water temperature above 20°C, attention must be paid to lesions that can easily be detected, such as dermatitis, rhinitis and stomatitis.

Marine debris as a barrier: Assessing the impacts on sea turtle hatchlings on their way to the ocean.

Marine debris is dispersed worldwide and has a considerable impact on biodiversity. In this study, the effect of marine debris on the time needed for hatchling loggerheads to reach the ocean once they have emerged from the nest was investigated. After a preliminary census of marine debris on different beaches of Boa Vista Island, Cape Verde, a field test was carried out with four different scenarios: low density marine debris, medium density marine debris, high density marine debris, and a control scenario. The time that hatchlings required to cross the different scenarios was recorded (n = 232). The results showed that crawl times were affected by the different marine debris scenarios, with the "high density" scenario specifically showing a significant difference from the control, low density and medium density scenarios. This study provides information on the risks of marine debris for hatchling sea turtles and provides conservation recommendations to reduce this potential risk.