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Does marine animal bones sink with no flesh? Is it heavy enough to sink nets? It could be a matter of a dumping ground for nets in one place and it floats arou

by Joakal 7y ago

Does marine animal bones sink with no flesh? Is it heavy enough to sink nets? It could be a matter of a dumping ground for nets in one place and it floats around oceans while the unlucky animals getting caught in net bring net to sea floor.

pvaldes 7y ago
> Is it heavy enough to sink nets? It depends on the type and size of the net. Dermochelys coriacea can weight 500Kg easily a) An obvious solution that would protect fisheries, and save the lives of thousands of marine birds, turtles, seals and whales, would be to change by international laws the matherial used in nets to made it more degradable in some points b) Another partial solution could be to build shredder ships c) And I suppose that anything that would replace part of the expensive fuel spent by very big war ships (aircraft carriers, etc) would save millions of dollars. Equipate this floating cities with secondary motors able to burn plastic instead gas would increase dramatically the autonomy of those ships, reduce the temptation to get ride of the garbage dumping it in the open sea, and would benefit also the environment, something that can be used to improve PR also. b) and c) could be combined in one solution allowing the shredder ships reducing their cost per hour at sea All they would need is to equipate ships with big particle filters like black boxes to store ALL the dioxins and noxious substances until real decontamination in appropiate ports. Modern cars have yet this technology. Some plastics are reciclable and could be sold and used as an economic resource instead as garbage. Just my 2 Cents
- leksak 7y ago
  > b) Another partial solution could be to build shredder ships Shredding the nets? Wouldn't this just make it a microplastics issue?
  - pvaldes 7y ago
    We have yet a microplastics problem in any case, but could deal with it later if we assure first that turtles, sharks, swordfishes, seals and dolphins will not go extinct by being tangled in ghost nets. This would alleviate the huge fishing pressure over all valuable species of fishes also. Two problems solved, one remains. Ghost nets gradually wipe top predators that reproduce slowly. This has a noxious and permanent effect in the ecosystems, hitting specially hard the animals affected more by microplastics: small larvae and small fishes. In marine ecosystems there is always a cascading card house effect. More predators not tangled in nets -> more big fishes eaten -> more small fishes survive. Even more important, more turtles alive to eat jellyfishes (wich gobble fish larvae and eggs but ignore microplastics). In the end the current influence of microplastics over small species would decrease compensated by a lower predation pressure. Heavy cetaceans on the other hand can store incredible amounts of nasty substances on its fat for many years. Microplastics would affect them less than the current ball of 50 Kg of bags blocking the stomach and leaking chemicals. Small plastic portions could have much more probability of passing trough the digestive system of big vertebrates without blocking it also. Would be safer for ship navigation also (Lose nets can tangle in boat propellers).

by Joakal 7y ago

pvaldes 7y ago

> Is it heavy enough to sink nets? It depends on the type and size of the net. Dermochelys coriacea can weight 500Kg easily a) An obvious solution that would protect fisheries, and save the lives of thousands of marine birds, turtles, seals and whales, would be to change by international laws the matherial used in nets to made it more degradable in some points b) Another partial solution could be to build shredder ships c) And I suppose that anything that would replace part of the expensive fuel spent by very big war ships (aircraft carriers, etc) would save millions of dollars. Equipate this floating cities with secondary motors able to burn plastic instead gas would increase dramatically the autonomy of those ships, reduce the temptation to get ride of the garbage dumping it in the open sea, and would benefit also the environment, something that can be used to improve PR also. b) and c) could be combined in one solution allowing the shredder ships reducing their cost per hour at sea All they would need is to equipate ships with big particle filters like black boxes to store ALL the dioxins and noxious substances until real decontamination in appropiate ports. Modern cars have yet this technology. Some plastics are reciclable and could be sold and used as an economic resource instead as garbage. Just my 2 Cents

leksak 7y ago
> b) Another partial solution could be to build shredder ships Shredding the nets? Wouldn't this just make it a microplastics issue?
- pvaldes 7y ago
  We have yet a microplastics problem in any case, but could deal with it later if we assure first that turtles, sharks, swordfishes, seals and dolphins will not go extinct by being tangled in ghost nets. This would alleviate the huge fishing pressure over all valuable species of fishes also. Two problems solved, one remains. Ghost nets gradually wipe top predators that reproduce slowly. This has a noxious and permanent effect in the ecosystems, hitting specially hard the animals affected more by microplastics: small larvae and small fishes. In marine ecosystems there is always a cascading card house effect. More predators not tangled in nets -> more big fishes eaten -> more small fishes survive. Even more important, more turtles alive to eat jellyfishes (wich gobble fish larvae and eggs but ignore microplastics). In the end the current influence of microplastics over small species would decrease compensated by a lower predation pressure. Heavy cetaceans on the other hand can store incredible amounts of nasty substances on its fat for many years. Microplastics would affect them less than the current ball of 50 Kg of bags blocking the stomach and leaking chemicals. Small plastic portions could have much more probability of passing trough the digestive system of big vertebrates without blocking it also. Would be safer for ship navigation also (Lose nets can tangle in boat propellers).