Dataset: Ichthyoplankton Density - Bongo
Deployment: GU17-04

Ichthyoplankton density and Plankton Displacement Volume data collected during the NSF RAPID Plankton Cruises using NOAA SEAMAP Bongo Plankton Nets

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)

Scientist:

Pamela Bond (NOAA Southeast Fisheries Science Center, NOAA SEFSC)

Denice Drass (NOAA Southeast Fisheries Science Center, NOAA SEFSC)

Glenn Zapfe (NOAA Southeast Fisheries Science Center, NOAA SEFSC)

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:

Fall 2017 SEAMAP Ichthyoplankton Survey, 0097

Data URL:

https://osprey.bco-dmo.org/dataset-deployment/829175/data

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Description

Methods & Sampling

Dataset acquisition description

The Bongo Plankton Net was deployed according to 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.

Nets were rinsed and processed on board and samples were 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. 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 less than the net mesh size. Then the plankton sample was resuspended in Ethanol. 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 were 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

Bongo Net

Supplied Name: NOAA SEAMAP Bongo Plankton Net

Supplied Description:

NOAA SEAMAP Bongo Plankton Net (60cm opening diameter, 335µm mesh width), equipped with General Oceanics Mechanical Flowmeter. Online depth sensor (Seabird) was supplied by research vessel to allow safe deployment. One of the two nets was used to determine larval fish densities. The net was deployed over the side.

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

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".

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 - Bongo
Deployment: GU17-04

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Ichthyoplankton Density - BongoDeployment: GU17-04

Dataset acquisition description

Dataset Processing Description

Dataset: Ichthyoplankton Density - Bongo
Deployment: GU17-04