Throughout: Lymph nodes tend to cluster next to blood vessels that feed all the abdominal organs. There are hundreds of lymph nodes within the abdominal cavity, the retroperitoneum (the area by the spine behind the intestines), the pelvis, and the groin. In fact, there all lymph nodes throughout the body (except the brain and eye). ...Read more.
The various fish groups account for more than half of vertebrate species. There are almost 28,000 known extant species, of which almost 27,000 are bony fish, with 970 sharks, rays, and chimeras and about 108 hagfish and lampreys.
Types of lean fish. Bass: A number of different freshwater and saltwater species are called âbass.â The freshwater basses such as largemouth and smallmouth bass are really members of the sunfish family, and are not commercially fished. The saltwater basses include sea bass and striped bass.