Explanation

(a) identification of Specimens:

• N - Water lettuce
• O - Cat Fish,
• P - Tilapia spp.

(b) Relationship between Catfish and Tilapia Spp: Catfish feeds on the fries/fingerlings of tilapia spp. OR Specimen O (Catfish) helps to control the population of specimen. Predator-prey relationship.

(c) Economic Importance of Specimen N in an aquatic ecosystem:

• Hinders free movement of aquatic organisms.
• Limits the penetration of light into ponds.
• Hinders proper aeration.
• Takes nutrients from the pond that could have been used by the planktons.
• Hides fishes from being sighted by predators.
• Some herbivorous fish feed on it. Interferes with fish harvesting.
• Competes with fish for dissolved oxygen for root respiration.
• Provides breeding ground for some fish species.
• Increases cost of production of fish.
• Makes navigation difficult.

(d) Ways of Controlling Specimen N:

• Physical removal by hand (manual).
• Remove it consistently/mechanically.
• Stock an adequate number of herbivorous fishes.
• Lime the pond properly before stocking.

• an argumentative essay to support the motion that says technical and vocational education should be mandatory in secondary school in... Answer this

  2 Answers   ·   English Language   ·   3 days ago
• who is the was the first nursing mother of the prophet(s.a.w)? Answer this

  1 Answers   ·   CRK/CRS   ·   1 day ago
• Please answer this. For those that there jamb result is still showing "under investigation" is there any news about or... Answer this

  1 Answers   ·   1 day ago