The following bar chart illustrates the changes in population of seals, whales and dolphins in the Gormez Straits for the time period between 2006 and 2018.
Overall, the number of dolphins increased consistently for the whole period of recordings, while the same figures for whales remained relatively stable.
According to the information provided by the graph, dolphins were the rarest fish in Gormez Straits in 2006 with the population of about 17 units, but every four-year period their share of total fish number rose, exceeding 20 units in 2010, then going above 30, and finally became the most common with just above 50 units.
At the same time, seals showed the opposite trend: if 43 seals were dominant above all in 2006, their number briefly collapsed almost twice. However, the further time went, their quantity gradually increased by about 10 units every four years, ultimately reaching 45 fish in 2018.
While two fish species mentioned above encountered the profound change in population, whales show quite uncommon trend. To be precise, their overall number did not go beyond the narrow range from 20 to 30 units during the entire period. In increased from 24 units only by 2 units from 2006 to 2010, then fell down to 22 four years later, but again went up, achieving 26 units in the last year of the recordings.