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Local degenerative changes in the drum muscles of piranhas (serrasalminae, characidae)
Abstract:
In the posterior drum muscle of the piranha structural alterations are frequently observed. Electron microscopic studies revealed a disordering of the myofibrils in these regions, accompanied by conspicuous changes in the mitochondria. As the degree of disorder increases, the mitochondrial cristae initially swell to form vesicles. Eventually the mitochondria become filled with myelin-like lamellar structures, which in many cases coalesce to form a dense outer wall. A striking concentration of lysosomes into localized masses was also characteristic of these regions.
Insights
Piranha posterior drum muscles show structural damage, with myofibril and mitochondrial changes. Lysosomes accumulate, indicating cellular stress and potential muscle dysfunction in these fish.
Area of Science:
- * Comparative muscle biology
- * Ichthyology
- * Cellular pathology
Background:
- * The posterior drum muscle of piranha is known for frequent structural alterations.
- * Understanding these changes is crucial for fish biomechanics and health.
Purpose of the Study:
- * To investigate the ultrastructural changes in piranha posterior drum muscle.
- * To characterize the alterations in myofibrils, mitochondria, and lysosomes.
Main Methods:
- * Utilized electron microscopy to examine muscle tissue.
- * Analyzed myofibril organization, mitochondrial morphology, and lysosome distribution.
Main Results:
- * Observed myofibril disordering and significant mitochondrial changes.
- * Mitochondria exhibited cristae swelling, vesicle formation, and myelin-like lamellar structures.
- * Found localized masses of lysosomes, suggesting cellular stress responses.
Conclusions:
- * Piranha posterior drum muscle displays distinct pathological alterations at the ultrastructural level.
- * Mitochondrial damage and lysosomal accumulation are key features of these changes.
- * These findings provide insights into the cellular basis of muscle dysfunction in piranha.