In the above figure, there was excessive commercial fishing of Atlantic Cod betw
ID: 95686 • Letter: I
Question
In the above figure, there was excessive commercial fishing of Atlantic Cod between 1960-1970. Given this information, which is true about evolutionary change in the Cod population due to commercial fishing?
-these fishing techniques selected for fish who reproduced at a younger age and size
-these fishing techniques selected against male fish
-these fishing techniques selected against female fish
-these fishing techniques selected against fish who produced at a younger age and size
7 Female Female -+- -+- Male 6 :No data available 5 3 1959 1961 1963 1965 1967 1969 1971 1973 1975 1977 1979 Year 2 8Explanation / Answer
Answer is A
These fishing techniques selected for fish who reporduced at a younger age and size.
If you look at the graph, the average age of female cod fishes was about 6 years and male cod fishes was about 5.5 years during commercial fishing activity in early 1960's which gradually fell to an average of 2.5-3 years by 1970's. This shows that the fishes were reproducing faster. Also,studies conducted have led the researchers to conclude that the cod's shift toward breeding earlier in life results from a genetic change brought on by overfishing. Therefore the answer is A.
Refer link for further reading :https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2924707/
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