Science activity 2636

Smelt Larva Survey

Description / purpose

The Smelt Larva Survey provides near real-time distribution data for longfin smelt larvae in the Delta, Suisun Bay and Suisun Marsh. Sampling takes place within the first two weeks in January and repeats every other week through the second week in March. Each 4-day survey consists of a single 10-minute oblique tow conducted at each of the 35 survey locations (see map) using an egg and larva net. The 505-micron mesh net is hung on a rigid frame shaped like an inverted-U, which in turn is attached to skis to prevent it from digging into the bottom when deployed. The net mouth area measures 0.37 m2. The conical net tapers back from the frame 3.35 m to a 1-liter cod-end jar, which collects and concentrates the sample. Immediately after each tow, juvenile fishes are removed, identified, measured and returned to the water immediately, and the remaining larvae are preserved in 10% formalin for later identification in the Lab in Stockton.

Activity status

  • Awarded / Initiating
  • In progress / Ongoing
  • Complete

Products & output

Type Title Description Impact
Report Smelt Larva Survey (SLS) 2019 Metadata tains programmatic details including contacts, pro 13 views
Link Smelt Larva Survey (SLS) website for Smelt Larva study 9 views
Link Lauren Damon gram Manager 11 views
Link Interagency Ecological Program (IEP) 2019 Work Plan and Funding s Work Plan reflects the annually‐planned work b 12 views

Funding summary



  • Region Region
  • Subbasin Subbasin

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