Histopathological analysis of two abalone (Haliotis fulgens and H.corrugata) : In order to evaluate tissue damage of possible pathogens and environmental stress

Abalone is an edible snail that faces challenges from climate change, overfishing,and diseases such as Withering Syndrome and Abalone Viral Ganglioneuritis.Withering Syndrome affects digestive organ tissues due to Xenohaliotiscaliforniensis, while Abalone Viral Ganglioneuritis targets nervous tissues fromabalone herpesvirus. In this study, the aim was to investigate tissue damage in twospecies of abalone (Haliotis fulgens and Haliotis corrugata) to identify potentialimpacts of pathogens or environmental stress. Histological sections from six partsof each organism were analyzed, assessing damage on a scale from zero to three.The results revealed various tissue abnormalities, including edema, inflammation,and delamination. Yellow abalone in December showed a concentration of browncells around their gonads' hepatopancreas, possibly indicating post-spawningactivities. Differences in habitat preferences and temperature tolerance highlightvarying environmental responses between blue and yellow abalone. Blue abaloneare notably more susceptible to acidophilic Rickettsia-like organisms, leading todelamination and edema. However, this result does not match the recorded effectin the same area from previous studies, which may indicate environmental factorssuch as thermal stress or harmful algal blooms.