Dataset: Larval Sebastes Diet and Morphometric Data

Name: Larval Sebastes Diet and Morphometric Data from R/V Bob and Betty Beyster, R/V Shearwater BBB2102, BBB2104, SW2104, BBB2101 from January to April 2021 (RAPID Anchovy Response project)
Published: 2024-10-11
Keywords: fish larvae, rockfish, Diet, zooplankton, ichthyoplankton, Sebastes, oceans

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Cite This Dataset

Spatial Extent: N:33.88995 E:-117.3841 S:32.848 W:-119.37

Southern California Bight and the Surrounding Coastal Areas

Temporal Extent: 2021-01-24 - 2021-04-06

Project:

RAPID: Understanding the unprecedented anchovy response to warm-water conditions in the California Current (RAPID Anchovy Response)

Principal Investigator:

Brice X. Semmens (University of California-San Diego Scripps, UCSD-SIO)

Co-Principal Investigator:

Michael R. Landry (University of California-San Diego Scripps, UCSD-SIO)

Scientist:

Rasmus Swalethorp (University of California-San Diego Scripps, UCSD-SIO)

BCO-DMO Data Manager:

Sawyer Newman (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2024-10-11

Restricted:

Validated:

Current State:

Preliminary and in progress

Larval Sebastes Diet and Morphometric Data from R/V Bob and Betty Beyster, R/V Shearwater BBB2102, BBB2104, SW2104, BBB2101 from January to April 2021 (RAPID Anchovy Response project)

Abstract:

This dataset includes body morphometrics of analyzed species of larval Rockfish (Sebastes spp.) from Bongo plankton net tows conducted in the subtropical Southern California Bight from January to April 2021. The larvae were dissected and the gut content analyzed. Prey taxa, development stage, length and width are also included in the data. Net tows were carried out on several cruises aboard R/V Bob and Betty Beyster and R/V Shearwater.

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Methods & Sampling

Specimen Collection

Larval rockfish were collected using a 71cm diameter dual Bongo plankton net system with 505 µm mesh nets and equipped with a small CTD to record depth and physical variables during horizontal net tows at a ship speed of 1.5-2.5 knots down to 28.9-36 m depth.

Collection Location Details

This study is carried out within the temperate to subtropical Southern California Bight and surrounding coastal areas between 32° and 35° N, and 117° and 120° W. Specific locations sampled fall within the CalCOFI and CCE-LTER programs quarterly survey grid from lines 76.7 to 93.4 and stations 26 to 55.

Specimen Processing and Measurement Methods

Once the net was retrieved the nets were gently rinsed with saltwater. The content of the cod-ends were immersed in a saltwater ice slurry to hopefully increase retention of gut contents, then concentrated onto a 300 µm mesh sized sieve, transferred into glass jars and preserved in tris-buffered 95% ethanol.

Rockfish larvae were sorted from the samples.161 individuals were selected to represent a range of sample stations and growth stages and measured (standard length, body depth, head length). Rockfish larvae were genetically identified as described in Thompson et al. (2016). The entire digestive tracts of the selected larvae were removed and dissected. Recovered prey items were identified to class or order level and by development stage (when applicable), length and widths were measured of all prey using an eyepiece micrometer, and measurements were converted to mm. Total body length was used for all organisms except copepods, where prosome length was measured instead. Length and width measurements are only given for prey intact enough to allow these measurements to be taken accurately.

Deployment Details

Each cruise is composed of one or more day trips using one of the two research vessels. The two-three letters indicate the research vessel, the four digits indicates YYMM.

Winter 2021 sampling took place during cruises BBB2101 and BBB2102
Spring 2021 sampling took place during cruses BBB2104 and SW2104

Problems/Issues

Unicellular and soft-bodied organisms likely underrepresented in gut contents due to their small size and fragile structure. “Copepoda” category includes copepods not identified to a higher taxonomic resolution; may include representatives from other copepod categories.

BCO-DMO Processing

- Removed units from column names (unit information can be found in the parameters section of the BCO-DMO metadata page).
- Spaces in column names replaced with underscores ("_").
- Corrected the spelling of "Sebates" to "Sebastes" in the primary data file.
- "Sebastes unidentified" replaced with "Sebastes" in the primary data file.
- Standardized capitalization of taxon terms represented in the primary data file.
- Standardized representation of taxon terms within the primary data file ("Euphausiid" changed to "Euphausiacea", "Eucalanid" changed to "Eucalanidae", "Tintinnid" changed to "Tintinnida", and "Bivalve" changed to "Bivalvia".
- AphiaIDs and LSIDs added from WoRMS database to represented Species and Prey Taxa in new columns in the primary data file.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-2053719

Deployments

Deployment	Start Date	Platform	Investigator
BBB2101	2021-01-23	R/V Bob and Betty Beyster	Rasmus Swalethorp (Chief Scientist)	data info
BBB2102	2021-02-01	R/V Bob and Betty Beyster	Rasmus Swalethorp (Chief Scientist)	data info
BBB2104	2021-04-06	R/V Bob and Betty Beyster	Rasmus Swalethorp (Chief Scientist)	data info
SW2104	2021-04-13	R/V Shearwater	Rasmus Swalethorp (Chief Scientist)	data info

Instruments

Bongo Net

Supplied Name: Bongo Plankton Net System

Supplied Description:

Larval fish were collected using a 71-centimeter (cm diameter dual Bongo plankton net system equipped with a small CastAway-CTD. The Bongo was equipped with two 505-micrometer (µm) mesh-size nets and a flowmeter mounted in the center of one of them.

Instrument Type

Generic Name: Bongo Net

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0009/

Generic Description:

A Bongo Net consists of paired plankton nets, typically with a 60 cm diameter mouth opening and varying mesh sizes, 10 to 1000 micron. The Bongo Frame was designed by the National Marine Fisheries Service for use in the MARMAP program. It consists of two cylindrical collars connected with a yoke so that replicate samples are collected at the same time. Variations in models are designed for either vertical hauls (OI-2500 = NMFS Pairovet-Style, MARMAP Bongo, CalVET) or both oblique and vertical hauls (Aquatic Research). The OI-1200 has an opening and closing mechanism that allows discrete "known-depth" sampling. This model is large enough to filter water at the rate of 47.5 m3/minute when towing at a speed of two knots. More information: Ocean Instruments, Aquatic Research, Sea-Gear

Microscope - Optical

Supplied Name: Zeiss Stemi 2000-C Dissecting Microscope

Supplied Description:

Larvae were measured, dissected, and prey identified and measured under a Zeiss Stemi 2000-C dissecting microscope equipped with a micrometer ocular.

Instrument Type

Generic Name: Microscope - Optical

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB05/

Generic Description:

Instruments that generate enlarged images of samples using the phenomena of reflection and absorption of visible light. Includes conventional and inverted instruments. Also called a "light microscope".

SonTek CastAway-CTD

Supplied Name: CastAway-CTD

Supplied Description:

Larval fish were collected using a dual Bongo plankton net system equipped with a small CTD to record depth and physical variables during horizontal net tows at a ship speed of 1.5 to 2.5 knots down to 14 to 36 meters (m) depth, depending on bottom depth.

Instrument Type

Generic Name: SonTek CastAway-CTD

Acronym: CastAway-CTD

Generic Description:

The Sontek CastAway-CTD (manufactured by Xylem) is a handheld castable instrument that provides instantaneous profiles of temperature, salinity, and sound speed. Each cast is referenced with both time and location using its built-in GPS receiver. The CastAway software displays profiles of the casts in addition to mapping the locations of the data collection points. The CastAway-CTD has a 5 Hz response and sampling rate, accurate to 0.1 (PSS-78), 0.05° Celsius.

Conductivity range is 0 to 100,000 µS/cm.
Temperature range is -5° to 45° Celsius.
Pressure range is 0 to 100 decibars.

Further specs and information can be found on the manufacturer's website: https://www.xylem.com/en-us/brands/wtw/wtw-products/castaway-ctd/

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise	Cruise identifier	unitless	cruise_id
ISO_DateTime_UTC	Date and time in UTC Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC
ISO_DateTime_PDT	Date and time in PDT (local) Format: %Y-%m-%dT%H:%M	unitless	ISO_DateTime_Local
Line	California Cooperative Oceanic Fisheries Investigations (CalCOFI) line	unitless	transect
St	California cooperative Oceanic Fisheries Investigations (CalCOFI) station	unitless	transect_station
Lat	Latitude	decimal degrees	lat
Long	Longitude	decimal degrees	lon
Tow_Depth	Max depth of net	meters (m)	depth_max
Mesh_Size	Bongo net mesh size	micrometers (um)	net_mesh
Larva_ID	Larval rockfish identifier	unitless	individual
Growth_Stage	Growth stage classification	unitless	stage
Species	Sebastes species name	unitless	species
Species_AphiaID	Aphia ID associated with the listed species	unitless	taxon_code
Species_lsid	LSID associated with the listed species	unitless	LSID
SL	Standard length	millimeters (mm)	length
BD	Body length	millimeters (mm)	length
HL	Head length	millimeters (mm)	length
Prey_Taxa	Prey item ID (taxonomic resolution varies between groups)	unitless	taxon
Prey_Taxa_AphiaID	Aphia ID associated with the listed prey taxa	unitless	taxon_code
Prey_Taxa_lsid	LSID associated with the listed prey taxa	unitless	LSID
Prey_Stage	Prey development stage	unitless	stage
Length	Prey length (prosome length for Copepods)	millimeters (mm)	length
Width	Prey width	millimeters (mm)	width

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Dataset: Larval Sebastes Diet and Morphometric Data