Dataset: Florida Straits 2014 & 2015 MOC4 Larval Fish Counts
Deployment: WS15161

Counts of larval fishes collected by a 4m2 MOCNESS in a subtropical, pelagic environment

View Data: For data, See Dataset Metadata Page: https://osprey.bco-dmo.org/dataset/661268

Principal Investigator:

Robert K. Cowen (Oregon State University, OSU-HMSC)

Co-Principal Investigator:

Su Sponaugle (Oregon State University, OSU-HMSC)

Contact:

Miram Gleiber (Oregon State University, OSU-HMSC)

BCO-DMO Data Manager:

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

Project:

Spatial variability of larval fish in relation to their prey and predator fields: Patterns and interactions from cm to 10s of km in a subtropical, pelagic environment (OSTRICH)

Current State:

Final no updates expected

Version:

07 Oct 2016

Deployment Synonyms:

OSTRICH 2015

Version Date:

2016-10-07

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Description

Counts of larval fishes collected by a 4m2 Multiple Opening Closing Net and Environmental Sampling System (MOCNESS; MOC4) in a subtropical, pelagic environment.

Restricted dataset: Data are currently restricted pending publication of the manuscript. Please contact the PI for prior access.

Methods & Sampling

Dataset acquisition description

Larval fishes were collected at each station using a Multiple Opening Closing Net and Environmental Sensing System (MOCNESS, http://www.whoi.edu/instruments/viewInstrument.do?id=10008) with a 4 square meter opening and 1 mm mesh nets (MOC4). To capture larval fishes and mesozooplankton on a fine horizontal spatial scale, we sequentially fired each MOCNESS net every ~125-500 m. Traveling at a speed of 2 meters per second each MOC4 net sampled ~500-2600 cubic meters. We fired a total of five nets per tow. One net was open from the surface to depth (net zero), and four nets sampled discrete depths. At every station, this fine-scale net sampling was repeated with two MOC4 tows at 15 m and 30 m depth (randomized order), thus eight replicate tows per depth. Once onboard, the nets were rinsed with seawater and the contents of each cod end immediately preserved in 95% ethanol.

Data Processing Description

Dataset Processing Description

All larval fishes were separated out of the samples, enumerated, and stored for later taxonomic identification.

BCO-DMO Processing:
- added official cruise ID corresponding to the PI-provided cruise name;
- modified parameter names to conform with BCO-DMO naming conventions;
- formatted dates to mm/dd/yyyy and times to hh:mm:ss;
- replaced -999 with "nd" (meaning "no data");
- joined the station location data to the MOC data;
- 05-Dec-2018: replaced v1 of dataset with v2, which has corrections made to volume filtered.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1419987	NSF Division of Ocean Sciences

Instruments

MOCNESS

Supplied Name: MOC4

Supplied Description:

Instrument Type

Generic Name: MOCNESS

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. There are currently 8 different sizes of MOCNESS in existence which are designed for capture of different size ranges of zooplankton and micro-nekton Each system is designated according to the size of the net mouth opening and in two cases, the number of nets it carries. The original MOCNESS (Wiebe et al, 1976) was a redesigned and improved version of a system described by Frost and McCrone (1974).(from MOCNESS manual) This designation is used when the specific type of MOCNESS (number and size of nets) was not specified by the contributing investigator.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
study	Study type: Spatial, Lagrangian, or Eddy	unitless	brief_desc
cruise_name	Cruise name	unitless	cruise_name
cruise_id	Official cruise identifier	unitless	cruise_id
station	Station identifier	unitless	sta
area	Eddy region sampled	unitless	site_descrip
tow_type	Tow type: S = shallow, M = middle, D = deep	unitless	brief_desc
rep	Replicate MOC4 tow at each station	unitless	replicate
tow_descrip	Description of tow area: NS = nearshore tow, Off = offshore tow	unitless	brief_desc
day_or_night	D = daytime tow, N = nighttime tow	unitless	time_of_day
location	In = inside eddy tow, Ed = eddy edge tow, Out = outside eddy tow	unitless	site_descrip
net	MOC4 tow net number	unitless	net
date	Date of tow (EDT) in mm/dd/yyyy format	unitless	date
time_open	Time (24h) net opened (EDT) in hh:mm:ss format	unitless	time_open
time_closed	Time (24h) net closed (EDT) in hh:mm:ss format	unitless	time_end
depth_open	Depth net opened	meters (m)	depth_open
depth_close	Depth net closed	meters (m)	depth_end
tow_vol	Colume of water towed by net; "nd" if volume was not recorded.	cubic meters (m^3)	vol_filt
larval_fish_count	Number of larval fish in net	unitless	count
lat_start	Latitude when net tow started	decimal degrees	lat
lon_start	Longitude when net tow started	decimal degrees	lon
lat_end	Latitude when net tow ended	decimal degrees	lat
lon_end	Longitude when net tow ended	decimal degrees	lon

Database

Contribute Data

Dataset: Florida Straits 2014 & 2015 MOC4 Larval Fish Counts
Deployment: WS15161

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Florida Straits 2014 & 2015 MOC4 Larval Fish CountsDeployment: WS15161

Dataset acquisition description

Dataset Processing Description

Dataset: Florida Straits 2014 & 2015 MOC4 Larval Fish Counts
Deployment: WS15161