Final answer:
The animal skull's identification would involve marine biology and paleontology, given the span of animal references from historical artifacts to prehistoric marine life.
Step-by-step explanation:
The question aims to identify the animal to which a skull found by a fisherman in the Baltic Sea belongs. Although there is a mix of information provided, the relevant information points towards the study of marine biology and possibly paleontology, considering the variety of animals referenced, which range from Mesolithic carvings to prehistoric fish. Determining the origin of the skull will likely require knowledge of marine animal anatomy, local sea life species, and potentially historical context if the skull is ancient or unique to a specific historical period or culture.
An example of a shark speacies that fits this description is the Great White Shark. Great White Sharks have cartilaginous skeletons and pectoral fins that are not fused with their head. They are known for their distinctive head shape and large, sharp teeth.This strange skull can provide valuable insights into the marine ecology of the Baltic Sea and the diversity of fish species in that region. Further analysis, such as examining the teeth or other features of the skull, could help determine the exact species of fish it belonged to.