Dataset: Ichthyoplankton Density - Ring
Deployment: PS1813

Ichthyoplankton density and plankton displacement volume data collected using SEA-GEAR plankton ring nets on the NSF RAPID Plankton Cruises in the Northwestern Gulf of Mexico in 2017-2018

Principal Investigator:

Simon Geist (Texas A&M, Corpus Christi, TAMU-CC)

Co-Principal Investigator:

Kelly L. Robinson (University of Louisiana at Lafayette)

Astrid Schnetzer (North Carolina State University, NCSU)

Beth Stauffer (University of Louisiana at Lafayette)

Student:

Shannan McAskill (Texas A&M, Corpus Christi, TAMU-CC)

Stormy Paxton (Texas A&M, Corpus Christi, TAMU-CC)

Contact:

Kelly L. Robinson (University of Louisiana at Lafayette)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Collaborative Research: RAPID-HARVEY: Response of plankton assemblages and trophodynamics to a historic, hurricane-induced floodwater plume in a subtropical, pelagic environment (RAPID Plankton)

Deployment Synonyms:

RPD-1

Data URL:

https://www.bco-dmo.org/dataset-deployment/829495/data

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Description

Methods & Sampling

Dataset acquisition description

The Ring Plankton Net was deployed using the same procedures reported for the NOAA Bongo Plankton Net in the "NOAA SEAMAP Field Operations Manual for collection of data, Chapter V., National Marine Fisheries Service and Gulf States Marine Fisheries Commission, October 2001, Revision No.4."

Target Fishing Depth as much of the water column as possible stopping 2-4m above the bottom at bottom depths <200m, and upper 200m at bottom depths >200m; ship speed 1.5-2.0 knots; target wire angle of 45°; winch speeds during pay out and retrieving according to Chapter V., Table A. The net was deployed over the side.

Nets were rinsed and processed on board. A subset of larval fish was picked on board and frozen at ultra-low temperatures in liquid nitrogen and kept in an on-board Ultra Low Temperature Freezer, transported using a Dry Shipper to Texas A&M University Corpus Christi and stored in an ULT until further processing. The remainder of the sample was preserved in 200 proof Ethanol (ETOH) according to NOAA SEAMAP Operations Manual upon retrieval of nets. After 24 hours, ETOH was exchanged with fresh ETOH. ETOH Plankton samples were stored in 1000ml plastic jars until processing in the Geist Early Life History Research Laboratory at Texas A&M University Corpus Christi during 2017 and 2020. Total Zooplankton Displacement Volume was determined using a calibrated 1000ml measuring cylinder by subtracting the volume of ethanol without sample from the volume of ethanol with sample. The plankton sample was separated from ethanol using a concentrator sieve with a mesh size < than the net mesh size. Then the plankton sample was resuspended in ETOH and larval fish were picked under dissecting microscopes using feather steel tweezers. Every sample was looked through twice for quality check purposes.

Data Processing Description

Dataset Processing Description

Data Processing:
Filtered Volume was calculated according to the manufacturer manual of the flowmeter (General Oceanics):

Filtered Volume = distance towed * net opening area,

with distance towed calculated as:

Flowmeter Count Difference * Flowmeter Constant / 999999.

Total Plankton Displacement Volume and Total Larval Fish Density was standardized per 100m³ filtered water volume and per area as under 10m² water column using the same formula as NOAA SEAMAP Pascagoula Office (POC G. Zapfe).

BCO-DMO Processing:
- concatenated separate files into one dataset;
- converted date format to YYYY-MM-DD;
- removed commas from the FM_CO field;
- added ISO date-time fields;
- added Cruise_ID numbers.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1760674	NSF Division of Ocean Sciences

Instruments

Mechanical Flowmeter

Supplied Name: General Oceanics Mechanical Flowmeter

Supplied Description:

Instrument Type

Generic Name: Mechanical Flowmeter

Generic Description:

Manufactured by General Oceanics, a mechanical flow meter is used with plankton tows to determine the volume of water which flows through the net. Flow meters are also used in rivers, estuaries, canals, sewer outfalls, pipes, and harbor entrances to determine water velocity and flow distance information.

Microscope - Optical

Supplied Name: Dissecting microscope

Supplied Description:

Larval fish were picked under dissecting microscopes using feather steel tweezers.

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".

Ring Net

Supplied Name: SEA-GEAR Plankton Ring Net

Supplied Description:

SEA-GEAR Plankton Ring Net (1m opening diameter, 1000µm mesh width, 3:1), equipped with General Oceanics Mechanical Flowmeter. Online depth sensor (Seabird) was supplied by research vessel to allow safe deployment.

Instrument Type

Generic Name: Ring Net

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/22/

Generic Description:

A Ring Net is a generic plankton net, made by attaching a net of any mesh size to a metal ring of any diameter. There are 1 meter, .75 meter, .25 meter and .5 meter nets that are used regularly. The most common zooplankton ring net is 1 meter in diameter and of mesh size .333mm, also known as a 'meter net' (see Meter Net).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Date	Date; format: YYYY-MM-DD	unitless	date
Cruise_ID	Cruise identifier	unitless	cruise_id
CR_N	Project Internal Cruise Name	unitless	cruise_name
P_SN	Project Internal Station Number	unitless	station
NOAA_SN	Respective NOAA SEAMAP/GOMECC Station Number	unitless	station
GEAR_T	Plankton Net Gear Type	unitless	instrument
MESH_W	Plankton Net Mesh Width	micrometers (um)	net_mesh
NET_NO	Net number, if gear has more than 1 net	unitless	net
NET_DIA	Diameter of the net	meters (m)	net
STA_LAT	Generalized Station Latitude	decimal degrees	lat
STA_LON	Generalized Station Longitude	decimal degrees	lon
BOT_D	Assigned Bottom Depth	meters (m)	depth_bottom
MAX_ND	Max Net Depth	meters (m)	depth_max
MIN_ND	Min Net Depth	meters (m)	depth_min
D_TW	Depth of Tow FD_TW = MAX_ND - MIN_ND	meters (m)	depth
TGI_GMT	Time Gear In (GMT), Net starting fishing; format: hh:mm	unitless	time
TGO_GMT	Time Gear Out (GMT), Net stopping fishing; format: hh:mm	unitless	time
TGI_CST	Time Gear In (CST), Net starting fishing; format: hh:mm	unitless	time
TGO_CST	Time Gear Out (CST), Net stopping fishing; format: hh:mm	unitless	time
TT	Time towed, Duration of Net fishing; format: hh:mm:ss	unitless	time_elapsed
FM_M	Flowmeter Manufacturer	unitless	instrument
FM_IC	Flowmeter initial count	unitless	flow
FM_FC	Flowmeter final count	unitless	flow
FM_CD	Flowmeter count difference	unitless	flow
FM_CO	Flowmeter Constant, Manufacturer Supplied	unitless	flow
DIS_T	Distance of Net towed through the water based on flowmeter readings	meters (m)	len_track
NET_OA	Net Opening Area	square meters (m²)	net
FIL_V	Filtered Volume	cubic meters (m³)	vol_filt
EV_WP	ETOH with Plankton (ml)	milliliters (ml)	sample_volume
EV_WOP	ETOH without Plankton (ml)	milliliters (ml)	sample_volume
PLA_D	Plankton Displacement Volume = ETOH with Plankton - ETOH without Plankton	milliliters (ml)	disp_vol
PLA_DD	Total Plankton Displacement Volume Density per 100 cubic meters filtered water volume	milliliters per 100 cubic meters (ml/100m3)	disp_vol
PLA_DA	Total Plankton Displacement Volume under 10m² area of the water column, PLA_DA = PLA_D * ((FD_TW / FIL_V) * 10)	milliliters under 10 square meters (ml/10m2)	disp_vol
TFILA	Total Larval Fish Number in sample	number of larval fish	number
TFILA_DV	Total Larval Fish Density per filtered water volume	larval fish per 100 cubic meters	abundance
TFILA_DA	Total Larval Fish Density under 10m² area, TFILA_DA=TFILA * ((FD_TW / FIL_V) * 10)	larval fish under 10 square meters (Ind./ 10m2)	abundance
TGI_ISO_DateTime_GMT	Date and Time Gear In (GMT), Net starting fishing; formatted to ISO8601 standard: YYYY-MM-DDThh:mmZ	unitless	ISO_DateTime_UTC
TGO_ISO_DateTime_GMT	Date and Time Gear Out (GMT), Net stopping fishing; formatted to ISO8601 standard: YYYY-MM-DDThh:mmZ	unitless	ISO_DateTime_UTC

Database

Contribute Data

Dataset: Ichthyoplankton Density - Ring
Deployment: PS1813

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Ichthyoplankton Density - RingDeployment: PS1813

Dataset acquisition description

Dataset Processing Description

Dataset: Ichthyoplankton Density - Ring
Deployment: PS1813