Could a Conifer trees over pond cause diseased to fish?

Conifer trees can potentially cause disease in fish if the trees are not properly maintained and their needles and cones are allowed to fall into the pond.

Conifer trees, such as pines, spruces, and firs, produce a resinous sap that can be harmful to fish. When the needles and cones of these trees fall into a pond, they can release the sap into the water. The sap can then coat the gills of the fish, making it difficult for them to breathe. In addition, the sap can also cause skin irritation and other health problems in fish.

If you have conifer trees near your pond, it is important to rake up the needles and cones regularly to prevent them from falling into the water. You should also trim the trees back so that they do not overhang the pond. If you do not take these precautions, you could end up with diseased fish or even dead fish.