Cephalopholis argus fish census and assemblage data from the West Hawaii Roi Removal Project 2010-2012 (NODC Accession 0099263)

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Frequently anticipated questions:

What does this data set describe?

Cephalopholis argus fish census and assemblage data from the West Hawaii Roi Removal Project 2010-2012 (NODC Accession 0099263)
This project examined the results of the field manipulative experiment that has been set up to test the ecological effects of introduced roi on reef fish associations in West Hawaii. This on-going research project, which began in September 2010, evaluates the impact of roi removal by collaborating with local fishers to remove >90% of the roi from a patch reefs in Puako, West Hawaii.

In situ observations of the introduced predatory grouper roi (Cephalopholis argus) were taken semi-annually within the coral reef ecosystem of Puako, northwest side of the Island of Hawaii October 2010 - July 2012. Visual fish transects were made at a depth range of 10-20 m. Tow board and standard visual belt transects were employed at control, reference, and treatment sites. Data include biometrics (length and weight) and biomass of roi, as well as an assemblage of other fish and feed guilds. Additional data on the movement of roi within the Puako area were collected using a fish tagging program followed by surveys for recapture and resighting.

NODC Accession 0082197 contains similar data from November 2010 - June 2011. There is some overlap of data within 0082197 and the present accession.

Entry_ID Unknown Sensor_Name SCUBA Project_Campaign:Hawaii Coral Reef Initiative Originating_Center: Nature Conservancy and Univ. Hawaii Storage_Medium: MS 2007 Excel Reference: None Online_size: 5,903 kbytes
  1. How should this data set be cited?

    Birkeland, Dr. Charles , Conklin, Dr. Eric , and Giddens, Ms. Jonatha , Unknown, Cephalopholis argus fish census and assemblage data from the West Hawaii Roi Removal Project 2010-2012 (NODC Accession 0099263).

    Online Links:

    • https://accession.nodc.noaa.gov/0099263

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -155.841
    East_Bounding_Coordinate: -155.833
    North_Bounding_Coordinate: 19.98452
    South_Bounding_Coordinate: 19.97524

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 01-Nov-2010
    Ending_Date: 22-Jul-2012
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

    2. What coordinate system is used to represent geographic features?

  7. How does the data set describe geographic features?


    0-data/ This directory contains the files as provided by the contributor

    filename: Puako_Roi_HCRI_Annual_Birkeland_Giddens_8_29.pdf format: PDF content: NOAA Project Final Report

    filename: Puako_roi_census_Birkeland_Giddens_2012.xlsx format: MS Office Excel 2007 content: Roi census data column: Date of dive content: month/day/year of observation column: Diver name content: Initials of diver CHW: Chad Wiggins JLG: Jonatha Giddens KAS: Kosta Stamulous KSP: Kydd Pollock RJA: Russel Amimoto ZRC: Zach Caldwell column: Census content: 1: April 2011, 2: June 2012, 3: Nov 2011, 4: June 2012 column: Number roi content: count of roi sized and weighed, always 1 column: Size Roi (cm) content: estimated length fin to snout column: Weight (g) content: estimated weight based on length

    filename: Puako_roi_fish_assemblage_Birkeland_Giddens_2012.xlsx format: MS Office Excel 2007 content: belt transects and tow-boards to observe the community fish column: Location content: observation site, either Treatment, Control, or Reference column: Survey_round content: chronologically ordered survey of given transect location column: Month content: date of observation column: Transect content: transect ID column: Taxa content: taxa type column: Family content: biological classification within family column: Feed Guild content: category of the group of species that exploit similar resources column: Max_TL content: maximum total length of given taxa, from tip of snout to tip of tail fin, cm column: Length (cm) content: length of individually observed taxa, snout to fin, cm column: Length_weight (g) content: estimated weight (g) of the given length column: Count content: how many seen on transect column: Biomass content: total biomass of taxa on transect (g/125m2)

    filename: Puako_roi_tag_Birkeland_Giddens_2012.xlsx format: MS Office Excel 2007 content: Roi tagging and movement data, details given below under 1-data

    1-data/ This directory contains files generated by NODC. Most files are comma-separated version (CSV) text exports of the unique sheets of the original MS Excel files in 0-data/.

    There is one file for each sheet within each original MS Excel file. The file name is the original MS Excel filename root appended with the individual sheet name. For files that had only one sheet, then the root name is the same.

    file: filename: Puako_Roi_HCRI_Annual_Birkeland_Giddens_8_29.pdf format: PDF/A content: this is a redundant copy of the report in /0-data, though in the PDF/A (archive) format, a standard for archives.

    file: Puako_roi_census_Birkeland_Giddens_2012.csv format: ASCII text comma-separated version content: defined in 0-data

    file: Puako_roi_fish_assemblage_Birkeland_Giddens_2012.csv format: ASCII text comma-separated version content: defined in 0-data

    file: Puako_roi_tag_Birkeland_Giddens_2012_Roi_tag.csv format: ASCII text comma-separated version content: sheet 1, Tagging data column: Date content: mm/dd/yyyy, date tagged column: Group content: tagging zone (physical location, 1-6) column: Lat content: latitude decimal degrees from GPS column: Long content: longitude decimal degrees from GPS column: TL (cm) content: total length tail fin to snout in cm column: SL (cm) content: standard length (from snout to the start of the caudal peduncle) in cm column: Weight(kg) content: weight of tagged fish in kilograms column: Tag_number content: ID written on the tag column: T-color content: color of tag column: T-position content: location on fish of tag

    file: Puako_roi_tag_Birkeland_Giddens_2012_Roi_recapture.csv format: ASCII text comma-separated version content: sheet 2, data on recaptured fish column: Fish_ID_tag content: tag for fish identification column: Tag_number content: tag number for fish identification column: Date_tag content: mm/dd/yyyy, date tagged column: Time_tag content: hh:min tagged Hawaii Standard Time column: Lat_tag content: latitude of tagged fish measured by GPS column: Long_tag content: longitude of tagged fish measured by GPS column: Date_capture content: mm/dd/yyyy, date captured column: Lat_capture content: latitude of captured fish measured by GPS column: Long_capture content: longitude of captured fish measured by GPS column: Tag_number content: ID written on the tag (for color coded tags) column: T-color content: color of tag

    file: Puako_roi_tag_Birkeland_Giddens_2012_Roi_Re_sight.csv format: ASCII text comma-separated version content: sheet 3, data on recaptured fish column: Date content: mm/dd/yyyy, date sighted column: Buffer content: buffer zone of re-sight column: Direction content: direction toward which fish moving column: Group content: tagging zone 1-6 column: Date_resight content: mm/dd/yyyy of resight column: Resight_Lat content: latitude from GPS of resighting column: Resight_Long content: longitude from GPS of resighting column: Tag_Position content: location on fish of sighted tag column: Group content: tagging zones 1-6

    Entity_and_Attribute_Detail_Citation: none

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    Hawaii Coral Reef Initiative Department of Biology; University of Hawaii at Manoa The Nature Conservancy of Hawai'i

  3. To whom should users address questions about the data?

    Ms. Jonatha Giddens
    University of Hawaii at Manoa
    graduate student
    2450 Campus Rd, Dean Hall Room 2
    Honolulu, HI 96822

    808-938-2764 (voice)

Why was the data set created?

1) Involve the local community in testing the effects of roi on fish assemblage characteristics by a predator removal experiment, 2) to assess the feasibility of roi removal as a management tool in west Hawaii, and 3) to map distributions and movements of roi in response to the 3-acre depletion experiment.

How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

    Date: Unknown (process 1 of 1)
    1) Movements of Roi Prior to removal activities, local fishers were contracted to assist with a roi tagging study. Tagging was implemented in order to assess the response of surrounding roi populations to the removal of roi at the treatment reef. Three buffer zones of 250-m concentric rings were designated with a specific tag type, color, and anatomical position on captured roi in order to facilitate underwater recognition of place of origin during subsequent underwater monitoring programs.

    Sixty-seven roi from the areas adjacent to the defined removal sites were captured in nets with diver-deployed handline and barrier nets, and tagged with a standard Hallprint tagging gun and t-bar tag. Tagging events were opportunistic from February to October 2011. Movements of tagged roi into the cleared area were noted during subsequent monitoring events, ranging from June 2011 to July 2012. The geographic coordinates of tagged and recaptured roi were obtained by matching the recorded time of capture/re-sight with the logged GPS time-track.

    2) Roi Removal Local fishers were contracted to assist with roi removal at the treatment reef (13,366 m2) during April and May of 2011. Spear-fishing for roi occurred over the course of 11 days. Fishers removed roi from the treatment reef with the number of fishers and hours fished recorded. Roi were collected, counted, sized, and weighed on site. Each diver's individual effort in dive time was recorded, along with the number of roi dispatched. Dive times ranged from 37 min to 56 min, and number of dives ranged from 1-3 per day.

    3) Fish Assemblage Monitoring A Before-After-Control-Impact experimental design was used to assess changes in reef fish assemblages associated with roi removal activities (Green 1979). Forty-seven permanent transect were established at randomly selected sites of similar habitat in removal areas and adjacent control sites. The study area for each of three study sites lie on Porites compressa dominated habitat types with similar habitat complexity.

    At these sites, visual fish transects were conducted following West Hawaii Aquarium Project (WHAP) survey protocols for 5 m x 25 m fish transects (Tissot et al. 2004), whereby two scuba divers swim in tandem along 25-m fixed replicate transect at a constant speed (15 minutes per transect). All fishes observed within the transect were identified to the lowest possible taxon and placed in size bins (0.0-4.9 cm TL, 5.0-9.9 cm TL, 10.0-14.9 cm TL, etc.). Divers were previously trained in visual underwater size estimation techniques based on practice with various lengths of fish models that were later collected and measured.

    Two rounds of data were collected from the suite of removal and control sites during November 2010 and March/April 2011, before any roi removal was implemented in order to establish baseline conditions at these sites (data within NODC accession 0082197). Surveys were conducted again one month after roi were removed from the experimental sites during June and November 2011 and then again in June 2012, six-months and one-year after roi removal. This quarterly monitoring schedule was implemented for the first year, and surveys will be conducted bi-annually for the duration of the project, which is expected to continue through 2015. The power for this design was 0.877 for a one-way ANOVA for the prey taxa abundance following roi removal after six-month. Power was calculated in Minitab16 using the maximum difference between means, standard deviation, and sample size (each replicate transect) to calculate the power of the data set. With additional post-removal surveys in the coming years, temporal changes on the individual transects will become the replication of this repeated measures BACI design.

    4) Roi Distribution Monitoring In order to assess roi population distributions throughout the wider region, a fish census focusing solely on roi was conducted bi-annually in removal and control areas. This census was conducted using tow-boards following NOAA Coral Reef Ecosystem Division (CRED) protocols, and followed isobaths from 10 m-30 m, covering a total area of 0.4 km2. These census rounds took place in April, June, and November 2011 and in June 2012. Two divers were deployed along a 50-m tow line, each with a planning board; one diver had a telegraph system to communicate with the boat. Divers were towed at a constant speed along a set bearing. Maintaining depth 3 m from the benthos, divers recorded each roi sighting of within 5 m either side of the straight line trajectory. Communication was maintained between diver pairs both above water and during the survey, to ensure that roi were not double counted. Each roi sighting was recorded along with the roi body-size and time of sighting. The roi sight time was later matched to the boat GPS log of time at geographic location. The offset from the boat GPS location to diver location along the tow line was calculated by the formula a2+b2=c2, where a=depth, c=tow-line length, and b=distance from the boat GPS location.

    INSTRUMENT TYPES: visual observations hand held GPS

    REFERENCES: Green RH. 1979. Sampling design and statistical methods for environmental biologists. Wiley Chichester.

    Tissot BN, Walsh WJ, Hallacher LE. 2004. Evaluating effectiveness of a marine protected area network in West Hawaii to increase productivity of an aquarium fishery. Pacific Science 58:175-188.

    Person who carried out this activity:

    Ms. Jonatha Giddens
    University of Hawaii at Manoa
    graduate student
    2450 Campus Rd, Dean Hall Room 2
    Honolulu, HI 96822

    808-938-2764 (voice)

  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    quality control completed

  5. How consistent are the relationships among the observations, including topology?

    see methodology

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints: Dataset credit required

  1. Who distributes the data set? (Distributor 1 of 1)

    NOAA/NESDIS/National Oceanographic Data Center
    Attn: Data Access Group, User Services Team
    SSMC-3 Fourth Floor
    Silver Spring, MD 20910-3282

    301-713-3277 (voice)
    301-713-3302 (FAX)

    Hours_of_Service: 8am-5pm, Monday through Friday
  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    NOAA makes no warranty regarding these data,expressed or implied, nor does the fact of distribution constitute such a warranty. NOAA, NESDIS, NODC and NCDDC cannot assume liability for any damages caused by any errors or omissions in these data, nor as a result of the failure of these data to function on a particular system.

  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 24-Jan-2017
Metadata author:
Mr. Patrick C. Caldwell
Hawaii/US Pacific Liaison
1000 Pope Road, MSB 316
Honolulu, Hawaii 96822

(808)-956-4105 (voice)
(808) 956-2352 (FAX)

Hours_of_Service: 8 AM to 5 PM weekdays
Contact_Instructions: check services@nodc.noaa.gov if not available
Metadata standard:

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