Brain histopathology and optic lobe atrophy of Short mackerel (Rastrelliger brachysoma) in the Upper Gulf of Thailand
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Abstract
Short mackerel, Rastrelliger brachysoma (Bleeker, 1851), is an economically important marine fish in the Gulf of Thailand that is potentially threatened by anthropogenic factors. Fifty specimens were obtained between October 2013 to February 2014 from wild populations, processed using standard histological techniques and stained with Harris’s hematoxylin and eosin. The results revealed important histopathological findings in the brain tissues of R. brachysoma including optic lobe atrophy with neuronal degeneration, vacuolar degeneration, melanomacrophage centers and cerebellar neuronal cell degeneration (12% prevalence). This preliminary study provided evidence that R. brachysoma in the Upper Gulf of Thailand lives under stressful conditions that likely impact brain function and possibly the fish’s overall health.
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