Several histological techniques are employed in aquaculture research: - Light Microscopy: The most common technique, which uses visible light to magnify tissue samples. - Electron Microscopy: Provides detailed images of the ultrastructure of cells using electron beams. - Immunohistochemistry: Involves the use of antibodies to detect specific proteins within tissues, useful for identifying pathogens and cellular responses. - In Situ Hybridization: Detects specific nucleic acid sequences within tissues, aiding in the study of gene expression.