Dataset: fishlarvae_M1
Deployment: EL9904

Georges Bank Fish Larvae, Growth Rates, Protein Content and Otolith Data Collected from MOCNESS Tows, 1992-1999.

Principal Investigator:

Larry J. Buckley (University of Rhode Island, URI-GSO)

Co-Principal Investigator:

Elaine Caldarone (Northeast Fisheries Science Center - Narragansett, NOAA NEFSC)

BCO-DMO Data Manager:

Danie Kinkade (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

U.S. GLOBEC Georges Bank (GB)

Current State:

Final with updates expected

Version:

2012-09-04

Version Date:

2012-09-04

Data URL:

https://www.bco-dmo.org/dataset-deployment/455395/data

Expand/Collapse All

Description

Principle objectives of the US GLOBEC Georges Bank Program were to study the composition of the larval fish community on Georges Bank, to define larval fish distribution across the Bank and within the water column, to determine those factors which influence their vertical distribution, and to determine bank-wide versus "Patch-Study" mortality and growth rates. Emphasis is on Atlantic cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) larvae along with their predators and prey. This study also includes larval distribution and abudance, analysis of feeding habits, and age and growth determination. These objectives were implemented through use of bongo nets and MOCNESS tows to make the animal collections.

Methods & Sampling

Dataset acquisition description

GLOBEC Fish Larvae were collected by MOCNESS nets.

For additional information on sampling and analytical methods, during the 1992 study (AL9205), see the Northeast Fisheries Science Center Reference Document 95-10: Georges Bank Stratification Study: 1992 Data Report.

Data Processing Description

Dataset Processing Description

BCO-DMO Processing Notes:

- Original data file was edited in excel by adding BCODMO convention header line, adding cruise and PI comment lines.

- Original file: “Buckley data for Georges Back GLOBEC website 8-6-2012.xls” contained both Bongo and MOCNESS data. This file was subsequently split into three separate data files based on gear and cruise type:

fishlarvae_M1 contains data from MOCNESS tows
fishlarvae_Bon_pro contains Bongo data from process cruises only
fishlarvae_Bon_bss contains Bongo data from broadscale cruises only

These datasets are served separately.

Additional edits to dataset fishlarvae_M1 :

Parameter names were edited to adhere to BCO-DMO and GLOBEC convention, of particular note are:
Moc_num was edited to tow
EDST was edited to time_local
species was edited to common_name because some animals were not identified to species level
cruisetype was edited to brief_desc

More information about this dataset deployment

Funding

Award Number	Funding Source
unknown GB NOAA	National Oceanic and Atmospheric Administration
unknown GB NSF	National Science Foundation

Instruments

MOCNESS1

Supplied Description:

The MOCNESS nets used to collect the samples associated with these data had a 333 micrometer mesh size.

Instrument Type

Generic Name: MOCNESS1

Acronym: MOC1

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0097/

Generic Description:

The Multiple Opening/Closing Net and Environmental Sensing System or MOCNESS is a family of net systems based on the Tucker Trawl principle. The MOCNESS-1 carries nine 1-m2 nets usually of 335 micrometer mesh and is intended for use with the macrozooplankton. All nets are black to reduce contrast with the background. A motor/toggle release assembly is mounted on the top portion of the frame and stainless steel cables with swaged fittings are used to attach the net bar to the toggle release. A stepping motor in a pressure compensated case filled with oil turns the escapement crankshaft of the toggle release which sequentially releases the nets to an open then closed position on command from the surface. -- from the MOCNESS Operations Manual (1999 + 2003).

Sea-Bird SBE-3 Temperature Sensor

Supplied Description:

Seabird temperature (Model 3) and conductivity (Model 4) sensors were mounted on MOCNESS hauls.

Instrument Type

Generic Name: Sea-Bird SBE-3 Temperature Sensor

Acronym: SBE-3 Temperature

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/134/

Generic Description:

The SBE-3 is a slow response, frequency output temperature sensor manufactured by Sea-Bird Electronics, Inc. (Bellevue, Washington, USA). It has an initial accuracy of +/- 0.001 degrees Celsius with a stability of +/- 0.002 degrees Celsius per year and measures seawater temperature in the range of -5.0 to +35 degrees Celsius. more information from Sea-Bird Electronics

Sea-Bird SBE-4 Conductivity Sensor

Supplied Description:

Seabird temperature (Model 3) and conductivity (Model 4) sensors were mounted on MOCNESS hauls.

Instrument Type

Generic Name: Sea-Bird SBE-4 Conductivity Sensor

Acronym: SBE-4 Conductivity

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0417/

Generic Description:

The Sea-Bird SBE-4 conductivity sensor is a modular, self-contained instrument that measures conductivity from 0 to 7 Siemens/meter. The sensors (Version 2; S/N 2000 and higher) have electrically isolated power circuits and optically coupled outputs to eliminate any possibility of noise and corrosion caused by ground loops. The sensing element is a cylindrical, flow-through, borosilicate glass cell with three internal platinum electrodes. Because the outer electrodes are connected together, electric fields are confined inside the cell, making the measured resistance (and instrument calibration) independent of calibration bath size or proximity to protective cages or other objects.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_id	Cruise Id, e.g., AL9306 represents the R/V Albatross cruise 9306.	dimensionless	cruise_id
year	Four digit year.		year
brief_desc	Brief description, open-ended and specific to dataset.	dimensionless	brief_desc
station	Identifier associated with cruise's stations.	dimensionless	station
lat	Latitude in decimal degrees.	decimal degrees	lat
lon	Longitude in decimal degrees, where negative values denote Westerly positions.	decimal degrees	lon
yrday0_local	Day of year at local time, where Jan 1 is day zero.	dimensionless	yrday0_local
day_local	Day of month in local time.	dimensionless	day_local
month_local	Month of year in local time.	dimensionless	month_local
time_local	Local time of observation or tow, originally reported as EDST (Eastern Daylight Savings Time).	hhmm	time_local
length_day	Number of hours between civil sunrise and civil sunset, originally reported as day_length.	decimal hours	length_day
tow	Number assigned to MOC1 tow. Submitted as "moc_num".	dimensionless	tow
net	MOC1 net number.	dimensionless	net
temp_avg	Average temperature, as observed by a CTD unit, "primary sensor", ITS 68 or 90 scale, reported in degrees C. For MOC1: average of measurements recorded while net was open.	degrees Celcius	temp
sal_avg	Average salinity, calculated from the CTD "primary sensors" of conductivity and temperature, Practical Salinity Scale, dimensionless. For MOC1: average of measurements recorded while net was open.	dimensionless	sal
sigma_t_avg	Average sigma-t density, in kg/m³ - 1000. For MOC1: average of measurements recorded while net was open.	kg/m^3 - 1000	sigma_t
depth_close	Depth at which MOCNESS net is closed.	meters	depth_close
depth_open	Depth at which MOCNESS net is opened	meters	depth_open
vol_filt	Volume of water filtered by net.	meters^3	vol_filt
depth_w	Water depth in meters.	meters	depth_w
sample	Unique identifier for obtained samples.	dimensionless	sample
common_name	Common name of sample, originally reported as species. Cod = Atlantic cod (Gadus morhua) and haddock is Melanogrammus aeglefinus.	dimensionless	common_name
length	Length of dead larval specimen, originally reported as larva_len.	mm	length
size_class	Larval size groupings (classes), based on actual or predicted protein content of a larva. If pro 1200 then size_class=4.	dimensionless	no_bcodmo_term
prot_total	Total amount of protein in a larva, submitted as PRO.	micrograms	no_bcodmo_term
RNA	Total amount of RNA in a larva.	micrograms	no_bcodmo_term
DNA	Total amount of DNA in a larva.	micrograms	no_bcodmo_term
rings	Total number of visible rings on an otolith, beginning at the hatch check or nucleus.	dimensionless	no_bcodmo_term
sagitta_diam	Total diameter of sagitta otolith as measured with microscope micrometer; originally reported as sag_diam.	microns	no_bcodmo_term
sagitta_chk_diam	Diameter of sagitta otolith up to the hatch check (nucleus), measured with microscope micrometer; originally reported as sag_chk_diam.	microns	no_bcodmo_term
lapillus_diam	Total diameter of lapillus otolith, measured with microscope micrometer; originally reported as lap_diam.	microns	no_bcodmo_term
growth	Instantaneous protein-specific growth rate (G per day) estimated from G = -0.147 + 0.009(avg_temp)+ 0.045(sRD), where sRD is the standardized ratio of RNA to DNA (reported in the data as RNA_DNA). Equation had been validated for cod and haddock larvae with protein content	G (per day)	no_bcodmo_term
RNA_DNA	The ratio of RNA to DNA standardized to a DNA/RNA standard curve slope ratio of 2.43; originally reported as srd.	dimensionless	no_bcodmo_term
prot_predicted	Predicted total amount of protein in larvae missing protein data. For cod, predicted protein = (20.67DNA) + 2.91. For haddock, predicted protein = (20.01DNA) - 3.22. This parameters was originally reported as predict_pro.	micrograms	no_bcodmo_term

Database

Contribute Data

Dataset: fishlarvae_M1
Deployment: EL9904

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: fishlarvae_M1Deployment: EL9904

Dataset acquisition description

Dataset Processing Description

Dataset: fishlarvae_M1
Deployment: EL9904