Morphology of the gastrointestinal tract of cascadura fish (Hoplosternum littorale) and its pathogenic fauna

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Abstract
Cascadura, (Hoplosternum littorale) is a delicacy in some countries; however, literature on this species is limited. This study aimed to identify gastrointestinal and hematological parasites and their potentially associated pathological effects in wild and farmed Cascadura in Trinidad. Samples of forty (40) wild and farmed Cascadura fishes were collected for this study. Morphometric measurements of whole fish and gastrointestinal tracts (GIT) were recorded. Blood smears were processed and stained with Wright’s Giemsa and GIT sections stained with Hematoxylin and Eosin (H&E) and Periodic Acid Schiff (PAS). The gross anatomy and histological features of the GIT of the Cascadura were consistent with the fish belonging to the Callichthyidae family. Hematological parasites were found in 13 out of the 40 (32.5%) fishes (nine wild; four farmed): 6 of 13 belonged to Alternaria spp. (15%), 6 of 13 were protozoa (15%) and 1 of 13 (5%) was a blood fluke belonging to the family Aporocotylidae. Three gastrointestinal nematodes were found in three wild fish, one identified as an anisakid. Gastric and intestinal structures appeared normal; however, inflammatory cells were found in one wild fish with damaged villi and degenerated epithelium of the intestine.

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