Take That's Howard Donald welcomes second son - and you'll never guess his name Howard and wife Katie Halil named their first child after music legend Bowie Share
There are three distinct groups of fish that ichthyologists study: bony fish, cartilaginous fish, and jawless fish. Ichthyology has a long history that began with simple observations and descriptions of fish over 200 years. The first known recorded observations of fish were documented by Pierre Belon in the 1500âs.
1 True fish â The strict biological definition of a fish, above, is sometimes called a true fish. 2  True fish are also referred to as finfish or fin fish to distinguish them from other aquatic life harvested in fisheries or aquaculture.