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Short Citation:
Southeast Fisheries Science Center, 2022: Red Porgy Reproductive Analysis, https://www.fisheries.noaa.gov/inport/item/8548.

Item Identification

Title: Red Porgy Reproductive Analysis
Short Name: Red Porgy Reproductive Analysis
Status: Completed
Abstract:

Protogynous fishes are often assumed to be more sensitive than gonochorists to exploitation, primarily because of potential sperm limitation and/or social disruption of mating if larger, mostly male individuals are selected for.

Almost 4000 red porgy were collected year-round, Mar 1998-Sep 2001, in the NE Gulf, primarily using standardized hook and line gear in depths of 22-92 m. Most (n=2,586) were collected at 9 sites off NW Florida in 30-68 m sampled repeatedly. Fish were aged using whole and broken and burned sagittae, and sexed and staged histologically (females and transitionals)or macroscopically (males). An early objective was to determine if the behaviorally-related size and/or sex selectivity observed in other protogynous species occurred in red porgy, i.e., were larger individuals or males at a site more aggressive and more likely to bite a hook and be caught before smaller ones or females. Non-parametric runs tests of ordered size and sex data showed no evidence of such selectivity, indicating that hook-and-line gear is a fair way to sample red porgy. More importantly, any evidence of truncation in size structure or skewing of sex ratios in exploited populations should not be attributed to greater aggression or '"hook attraction" in males but can be easily explained as the results of simple size-selective harvesting.

Histological evidence indicated that red porgy in depths of 20 to 78 m in the NE Gulf spawn wherever they occur, primarily Dec to Feb. Estimated size and age at 50% maturity for females was 211 - 216 mm TL and <2 yr. Sex change occurred wherever they were found, almost exclusively Mar-Nov, and across a wide range of sizes (206-417 mm TL) and ages (2-9 yr), strong evidence it is socially controlled. Red porgy are permanently sexually dichromatic. The premaxilla is green or bluish-green in males and pink or reddish in females. Observations of captive fish suggest they pair spawn. Seasonal patterns in catch rates and sex ratios, and widespread occurrence of spawning females indicated that red porgy do not form large, predictable spawning aggregations.

There was no evidence found that protogyny or their reproductive ecology might 1) explain the apparent crash of the red porgy stock(s) in the SAB or 2) make the species more sensitive to exploitation than gonochorists - in fact they are probably less sensitive in some cases. Many aspects of their biology and behavior, including widespread spawning grounds, no tendency to form spawning aggregations, absence of behaviorally-related size or sex selectivity, socially controlled sex change, co-occurrence of sexes year-round, and an extended period of transition, should stabilize or enable rapid compensation of sex ratios (preventing sperm limitation or disruption of mating). Socially controlled sex change also enables size and age of transition to slide downward as fishing truncates the size structure, similar to the declines in size and age at maturity seen in many gonochorists. Several population traits differed significantly among the 9 regular sites (which ranged from 1.3 to 58.4 km (0 = 28.7) apart), including size and age composition (K-S 2 sample test);

means ranged from 261 to 309 mm TL and 2.7 to 4.1 yr. Size at age varied considerably, primarily because of significant differences among sites. The relationships of mean size at age among sites were consistent across ages and temporally stable. Robson-Chapman maximum likelihood estimates of annual survival ranged from 38 to 65 % among sites, and 95% CI?s did not overlap for 6 of the 8 sites with estimates. Logistic regression indicated that the proportion of females changing sex differed significantly among sites (medians: 12 - 33%) and depths.

Sizes and ages at transition also varied spatially, with site-specific means of 266 - 313 mm and 3.1 - 4.6 yr. Sex ratio was yet another demographic that differed among sites: 28 of 36 pairwise comparisons were significant (log. regress.).

These persistent differences in population traits at such a small scale likely reflect phenotypic, not genetic, effects. Two factors - spatial heterogeneity of their environment and site fidelity - probably explain most of those differences. The live bottom habitat preferred by red porgy is widespread but very patchy. These patches, grossly similar, have variable hydrological, geological, biological, and ecological characteristics; and they range from unexploited to heavily exploited. Biological and ecological characteristics likely to vary among patches include density, predator and prey composition and density, and competition. Adult redporgy exhibit considerable site fidelity, so once recruited to a given patch of habitat, they are exposed to a unique suite of many factors which could affect growth, mortality, and reproduction. The consistent, persistent, significant differences in size and age structure, growth, xvi mortality, transition rates, size and ages at transition, and sex ratios among sites separated by only 10?s of kilometers strongly suggests that red porgy in the NE Gulf have a complex population structure composed of many local subpopulations. These subpopulations closely resemble Crowder et al. (2000) definition of sources and sinks areas of differing demographic rates dictated by underlying differences in habitat quality?. This complex structure is not the classical metapopulation of Levins (1970), i.e.,a A population of populations that go extinct and recolonize @and which are exposed to the same conditions in each habitat patch. It does, however, fit the broader definition of metapopulation espoused by Hastings and Harrison (1994), Hanski and Simberloff (1997), and Kritzer and Sale (2004), which relaxes the requirement for extinctions and recolonizations and does not require uniform conditions across patches.

Whether the population subunits are called local subpopulations, sources and sinks, or members of a metapopulation, the critical point is that many may have significantly different demographics and life history traits, which has potentially significant implications regarding stock assessment and management of red porgy. Data pooled from several subpopulations may yield skewed parameter estimates, which in turn could bias stock assessments and the models used to predict responses to exploitation. It could also introduce excessive variability to the parameter estimates. Such complexity could certainly frustrate and confound the efforts of those trying to assess the status of these stocks and predict the effects of fishing on them, as it requires examination of population biology at much smaller spatial scales than typically done and use of more complex, spatially-explicit population models.

It is likely that small scale population complexity has played some part in the failure of some southeastern U.S. reef fish fisheries to respond to management measures in recent years

Purpose:

Stock Assessment, Fisheries Research

Keywords

Theme Keywords

Thesaurus Keyword
UNCONTROLLED
None age structure
None demography
None growth
None life history
None mortality
None Pagrus pagrus
None protogyny
None Red Porgy
None reproductive ecology

Temporal Keywords

Thesaurus Keyword
UNCONTROLLED
None 1998-2001

Spatial Keywords

Thesaurus Keyword
UNCONTROLLED
None Alabama
None Florida
None Gulf of Mexico

Physical Location

Organization: Panama City Laboratory
City: Panama City
State/Province: FL

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Mixed
Maintenance Frequency: As Needed
Data Presentation Form: Table (digital)

Support Roles

Data Steward

CC ID: 565654
Date Effective From: 2017
Date Effective To:
Contact (Person): Gardner, Chris L
Address: 3500 Delwood Beach Road
Panama City, FL 32408
Email Address: chris.gardner@noaa.gov
Phone: 850-234-6541 x 262
Fax: 850-235-3559
Contact Instructions:

Phone or email

Distributor

CC ID: 301176
Date Effective From: 2018
Date Effective To:
Contact (Organization): Southeast Fisheries Science Center (SEFSC)
Address: 75 Virginia Beach Drive
Miami, FL 33149
USA
Phone: (305)361-5761
URL: https://www.fisheries.noaa.gov/about/southeast-fisheries-science-center
Business Hours: 8:00 a.m. - 4:30 p.m. EST

Metadata Contact

CC ID: 565655
Date Effective From: 2017
Date Effective To:
Contact (Person): Gardner, Chris L
Address: 3500 Delwood Beach Road
Panama City, FL 32408
Email Address: chris.gardner@noaa.gov
Phone: 850-234-6541 x 262
Fax: 850-235-3559
Contact Instructions:

Phone or email

Point of Contact

CC ID: 301178
Date Effective From: 2016
Date Effective To:
Contact (Person): Harrell, Emily
Contact Instructions:

Phone or email

View Historical Support Roles

Extents

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 33734
W° Bound: -88.34
E° Bound: -83.66
N° Bound: 30.24385
S° Bound: 25.851
Description

northeast Gulf of Mexico

Extent Group 1 / Time Frame 1

CC ID: 33735
Time Frame Type: Range
Start: 1998-01-01
End: 2001-12-31

Extent Group 1 / Time Frame 2

CC ID: 33736
Time Frame Type: Range
Start: 1994-01-01
End: 1994-12-31

Extent Group 1 / Time Frame 3

CC ID: 33737
Time Frame Type: Range
Start: 1997-01-01
End: 1997-12-31

Access Information

Security Class: Unclassified
Data Access Policy:

Download from appropriate url

Data Access Procedure:

Contact the individual identified as the distributor for this dataset. Please include the title of the dataset and the name of the data steward when requesting a copy of this data.

Data Access Constraints:

NOAA Data Quality Act Documentation and Pre-Dissemination guidelines

Data Use Constraints:

Data set is not for use in litigation. While efforts have been made to ensure that these data are accurate and reliable, NOAA cannot assume liability for any damages or misrepresentations caused by inaccuracies in these data, or as a result of these data being used on a particular system. NOAA makes no warranty, expressed or implied, nor does distribution constitute any such warranty

Metadata Access Constraints:

None

Distribution Information

Distribution 1

CC ID: 752372
Start Date: 2018
End Date: Present
Download URL: https://grunt.sefsc.noaa.gov/parr/8548.zip
Distributor: Southeast Fisheries Science Center (SEFSC) (2018 - Present)
File Name: 8548.zip
Compression: Zip
Review Status: Not Chked

Technical Environment

Description:

.xls files on pc

Data Quality

Conceptual Consistency:

Each time a site was fished, an attempt was made to catch 25-30 red porgies. If it became apparent that it would take several hours to reach that goal, I would stop sampling and move to a new location.

Quality Control Procedures Employed:

All fish were separated by collection site, placed on ice, and returned to the laboratory for processing the next day.

In the lab all fish were measured to the nearest mm total length (TL) and sexed macroscopically, after which histological samples were taken from the gonads of any identified as female or transitional. Final determination of sex was based on histological findings if available.

Data Management

Have Resources for Management of these Data Been Identified?: No
Approximate Percentage of Budget for these Data Devoted to Data Management: Unknown
Do these Data Comply with the Data Access Directive?: No
Is Access to the Data Limited Based on an Approved Waiver?: No
Approximate Delay Between Data Collection and Dissemination: N/A
Actual or Planned Long-Term Data Archive Location: NCEI-MD
Approximate Delay Between Data Collection and Archiving: N/A
How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?:

N/A

Lineage

Lineage Statement:

Describe in referenced documentation (Devries PhD Thesis)

Sources

The Life History, Reproductive Ecology, and Demography of the Red Porgy, Pagrus Pagrus, in the Northeastern Gulf of Mexico

CC ID: 565796
Contact Type: Person
Contact Name: DeVries, Doug
Publish Date: 2006-12-05
Extent Type: Range
Extent Start Date/Time: 2000-02-01
Extent End Date/Time: 2000-11-30
Citation URL: http://diginole.lib.fsu.edu/islandora/object/fsu:168117/datastream/PDF/view

Catalog Details

Catalog Item ID: 8548
GUID: gov.noaa.nmfs.inport:8548
Metadata Record Created By: Lee M Weinberger
Metadata Record Created: 2008-12-10 16:53+0000
Metadata Record Last Modified By: Lee M Weinberger
Metadata Record Last Modified: 2021-10-22 02:10+0000
Metadata Record Published: 2021-10-22
Owner Org: SEFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2022-10-23