▁its ▁consumption ▁by ▁zo op l ank ton ▁" sw imm ers ". ▁ ▁Tra ps ▁are ▁often ▁mo ored ▁at ▁a ▁specific ▁depth ▁in ▁the ▁water ▁column ▁( us ually ▁below ▁the ▁eu ph otic ▁zone ▁or ▁mixed ▁layer ) ▁in ▁a ▁particular ▁location , ▁but ▁some ▁are ▁so - called ▁L agr ang ian ▁tra ps ▁that ▁dr ift ▁with ▁the ▁surrounding ▁ocean ▁curr ents ▁( though ▁they ▁may ▁remain ▁at ▁a ▁fixed ▁depth ). ▁ ▁These ▁latter ▁tra ps ▁travel ▁with ▁the ▁bi ological ▁systems ▁that ▁they ▁study , ▁while ▁mo ored ▁tra ps ▁are ▁subject ▁to ▁vari ability ▁introduced ▁by ▁different ▁systems ▁( or ▁states ▁of ▁systems ) ▁" pass ing ▁by ". ▁ ▁However , ▁because ▁of ▁their ▁fixed ▁location ▁mo ored ▁tra ps ▁are ▁straightforward ▁to ▁recover ▁for ▁analysis ▁of ▁their ▁measurements . ▁ ▁L agr ang ian ▁tra ps ▁must ▁surface ▁at ▁a ▁pre - det erm ined ▁time , ▁and ▁report ▁their ▁position ▁( us ually ▁via ▁satellite ) ▁in ▁order ▁to ▁be ▁recovered . ▁ ▁See ▁also ▁ ▁Bi ological ▁p ump ▁ ▁f - rat io ▁ ▁Marine ▁snow ▁ ▁Mo oring ▁( o cean ography ) ▁ ▁Primary ▁production ▁ ▁References ▁ ▁Category : O cean ographic ▁instrument ation ▁Category : L im n ology <0x0A> </s> ▁Forest ▁Spr ings ▁is ▁a ▁rural ▁un in cor por ated ▁community ▁in ▁southern ▁Allen ▁County , ▁Kentucky , ▁United ▁States . ▁ ▁References ▁ ▁Category : Un in cor por ated ▁communities ▁in ▁Allen