In temperate (colder) water regions, REEF asks surveyors to also monitor a select regional list of invertebrates and algae. This is in addition to monitoring all fish seen during a survey.
- PNW: Pacific Northwest & Alaska
- CAL: California
- NE: Northeast US & Eastern Canada
- SAS: South Atlantic States
- EAM: Eastern Atlantic & Mediterranean
In these regions, surveyors have the option to conduct a Fish Only (FO) survey, an Invertebrates Only (IO) survey, or a Fish and Invertebrates (FI) survey.










