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I am conducting a survey which i will use as primary research for my extended project. 
If you can you may, State which of the following is the most destructive fishing practice. You may also give a reason why you choose that.
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Hi Alex. I fear that the answer depends on what you understand by "destructive" and what are you focusing at when assessing the effects: endangered species, community-wide effects, ecosystem services, or other.
Destructive can be translated into a number of attributes as being non-selective in the target, persistent in its effects, or effective in removing individuals. From this perspective, explosives and cyanide are the less selective and effective, while ghost fishing is the most persistent and less effective.
When one comes to focusing on response variables to assess the severity of the effects, shark finning remove top predators that are both important in structuring the community, can eventually lead to the alteration of ecosystem services (for example through releasing prey fishes and thereby altering the balance between coral-dominated and algae-dominated ecosystems) and generally endangered.
Still one can put the question in the perspective of wide-scale management for conservation purposes. Then other practices like bottom trawling (cited in the previous post) and also drifting nets would have higher impacts. The former because of its spatial extent and pervasive effects through communities and ecosystems. The second because its impact on charismatic species like dolphins, whales and turtles, which raise public concern and trigger in-the-field actions.
Possibly a multivariate approach in which you combine the scores given under different criteria for each activity, tailored for the societal values rooted in your study area, would provide a more complete albeit perhaps not definitive answer.
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I currently know of two - one (a snake) at Casas Grandes (Paquime) in Chichihuah and the other in the Municipio de Tacuichamona, in Sinaloa, (Weigand, personal communication 2010).  However, I am hereby canvassing the archaeological community to learn of any others.  Any and all information will be duly acknowledged in publication.  Many thanks!!
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Will do!