Proposed Abstract Title

Larval Rockfish in the Snohomish River Estuary

Type of Presentation

Poster

Session Title

General species and food webs

Location

2016SSEC

Description

Students at the Ocean Research College Academy, a dual enrollment program in Washington State, conduct research in the local estuary as part of longitudinal study that spans ten years. In addition to measuring water chemistry metrics (temperature, salinity, dissolved oxygen, pH, and nutrient levels), students collect plankton at four locations with varying distance to the mouth of the Snohomish River to assess abundance and diversity of the plankton assemblage. A vertical tow is collected from 10-50 meters (depending on depth) with a 335 micron mesh and a horizontal tow is collected for three minutes at the halocline with 20 micron mesh. Samples are then enumerated and classified, tracking spatial and temporal variation. A change in the protocol shifted from preservation (which were archived) to live observation of the net tows in 2014. Representative photographs are also taken. With the status of rockfish in the region, local NOAA researchers provided supplemental funding to assess presence or absence of juvenile rockfish in the archived samples, and upcoming collections (twice monthly) for the next three years. Over 50 archived samples have been assessed, with only three larval fish species present (none of which were rockfish). Upcoming work in the spring will target horizontal tows over eel grass beds and near kelp areas. Continued evaluation of the sampling and analysis protocol will be ongoing.

This document is currently not available here.

Share

COinS
 

Larval Rockfish in the Snohomish River Estuary

2016SSEC

Students at the Ocean Research College Academy, a dual enrollment program in Washington State, conduct research in the local estuary as part of longitudinal study that spans ten years. In addition to measuring water chemistry metrics (temperature, salinity, dissolved oxygen, pH, and nutrient levels), students collect plankton at four locations with varying distance to the mouth of the Snohomish River to assess abundance and diversity of the plankton assemblage. A vertical tow is collected from 10-50 meters (depending on depth) with a 335 micron mesh and a horizontal tow is collected for three minutes at the halocline with 20 micron mesh. Samples are then enumerated and classified, tracking spatial and temporal variation. A change in the protocol shifted from preservation (which were archived) to live observation of the net tows in 2014. Representative photographs are also taken. With the status of rockfish in the region, local NOAA researchers provided supplemental funding to assess presence or absence of juvenile rockfish in the archived samples, and upcoming collections (twice monthly) for the next three years. Over 50 archived samples have been assessed, with only three larval fish species present (none of which were rockfish). Upcoming work in the spring will target horizontal tows over eel grass beds and near kelp areas. Continued evaluation of the sampling and analysis protocol will be ongoing.