The Leeds fish, which lived in the mid-Jurassic period about 165 million years ago, was a huge fish in the dinosaur era. Leeds fish can grow to 9 meters long within 20 years after birth, and the largest body length can even reach 16.5 meters for Leeds fish with an average life span of about 40 years. This size is similar to that of the whale shark, the largest fish in modern times, and the average lifespan of the whale shark is about 70 years
the Leeds fish are likely to grow faster than the whale shark.
 Leeds fish and whale sharks both feed on plankton and small animals in the ocean, and there can be no big difference in the rate of growth.