Fisheries And Aquaculture FINAL EXAM Questions And
Answers 2023 Graded A+
Fisheries rely on the natural productivity of an ecosystem, therefore they are more like
(a)farming (b) hunting (b)hunting
what is one important way that fisheries and aquaculture operations are connected?
aquaculture ac...
Fisheries And Aquaculture FINAL EXAM Questions And Answers 2023 Graded A+ Fisheries rely on the natural productivity of an ecosystem, therefore they are more like (a)farming (b) hunting ✔✔(b)hunting what is one important way that fisheries and aquaculture operations are connected? ✔✔aquaculture activites rely to a large degree on fisheries for fish feed Over the last 20 years fisheries production has (a) increased (b) decreased (c) stayed the same, while aquaculture production has (d) increased (e) decreased (f) stayed the same ✔✔(c)stayed the same, while aquaculture production has (d) increased A 1971 prediction estimated that the sustainable annual catch is about 80 million tons. Global marine fisheries have been hovering at about 80 -85 million tons for the past 20 years (since 1990). Why have fisheries hovered close to that 1971 estimate? ✔✔Because fishing efforts have increased to compensate for diminishing catches Many of the top 10 species caught are planktivores. Why? ✔✔Because they are so numerous (being low on the food chain) that it makes sense to exploit them Some o f the top 10 species caught are predators. Why? ✔✔Because they are highly desirable and very profitable List two common effects of increasing fishing effort on a fisheries stock: ✔✔a. Decreasing biomass; b. Decreasing size How many of the traditional fis heries stocks: (a) Are depleted? ______% ✔✔90% How many of the traditional fisheries stocks: (b) Have collapsed? ______% ✔✔40% How many of the traditional fisheries stocks: (c) Are extinct? ______% 10 ✔✔7% Why could the management measure of releasing s mall fish be problematic? ✔✔Because the large fish that are kept may not necessarily be the oldest, but simply bigger, so the overall size of the population decreases Why could the shift from shelf to deep -sea fisheries be problematic? ✔✔Because deeper mo re vulnerable communities and stocks are exploited intensely What is by -catch and how can it be avoided? ✔✔By-catch is species not targeted by fisheries, and it can be avoided by specialized tools
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