Problem 6-12 paragraph construction construct a paragraph on the problems that arise when alien fish are in troduced into naturally fishless mountain lakes using the list of facts provided. in your writing, pay attention to writing a good topic sentence and to using good word location. employ paragraph consistency, key terms, and transitions. consider also other basic rules such as using par allel form and correct pronouns and prepositions. alpine lake ecosystem vative fauna negatively affected by introduced alien species mountain lakes are naturally fishless consequences of fish introduction are particularly bad common frog ecological exclusion observed for brook trout in the gran paradiso national park brook trout preys on frog larva solution: eradicate introduced fish to recover amphibian popula- tions in alpine lake.