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Gulf Shellfish Institute Inc

  • Palmetto, FL
  • Tax-exempt since Nov. 2016
  • EIN: 81-0747697

Organization summary

Type of Nonprofit

Designated as a Organizations for any of the following purposes: religious, educational, charitable, scientific, literary, testing for public safety, fostering national or international amateur sports competition (as long as it doesn't provide athletic facilities or equipment), or the prevention of cruelty to children or animals.

Category: Food, Agriculture and Nutrition / Agricultural Programs (NTEE)

Donations to this organization are tax deductible.

Summary charts: organization finances over time

Revenue
$505k (2024)

Expenses
$550k (2024)

Total Assets
$69.4k (2024)

Total Liabilities
$100k (2024)

Source: Form 990 tax filings from 2019 to 2024

Tax Filings by Year

Form 990 is an information return that most organizations claiming federal tax-exempt status must file yearly with the IRS. Nonprofit Explorer has IRS digitized Form 990 data for filings processed in 2012 and later. If this organization filed an amended return, it may not be reflected below. Duplicate download links may indicate a resubmission or amendment to this organization's original return. Form 990 data is from the IRS.

Fiscal Year Ending Dec.
2024

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$504,950
Expenses
$550,268
Net Income
-$45,318
Net Assets
-$30,554
Notable Sources of Revenue Percent of Total Revenue
Contributions $503,121
99.6%
Program Services $0
Investment Income $1,829
0.4%
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Notable Expenses Percent of Total Expenses
Executive Compensation $85,000
15.4%
Professional Fundraising Fees $0
Other Salaries and Wages $299,689
54.5%
Assets/Debt
Total Assets $69,446
Total Liabilities $100,000
Net Assets -$30,554
Compensation
Key Employees and Officers Compensation Related Other
Stephen Hesterberg Phd (Executive Director) $85,000 $0 $0
Curtis Hemmel (President) $0 $0 $0
Edward Chiles (Vice President) $0 $0 $0
Ernesto Lasso De La Vega Edd (Director) $0 $0 $0
William Arnold Phd (Secretary) $0 $0 $0
Joseph Cannon (Director) $0 $0 $0
Elizabeth Moore (Director) $0 $0 $0
Jefferey Sedacca (Director) $0 $0 $0
Joshua Patterson Phd (Director) $0 $0 $0
Dan Fitz Patrick (Treasurer) $0 $0 $0
Angela Collins Phd (Director) $0 $0 $0
Heath Davis (Director) $0 $0 $0
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Document Links

990
Filed on Nov. 14, 2025

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
XML

Fiscal Year Ending Dec.
2023

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$234,024
Expenses
$227,043
Net Income
$6,981
Net Assets
$14,764
Notable Sources of Revenue Percent of Total Revenue
Contributions $233,320
99.7%
Program Services $0
Investment Income $704
0.3%
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Notable Expenses Percent of Total Expenses
Executive Compensation $28,333
12.5%
Professional Fundraising Fees $0
Other Salaries and Wages $143,631
63.3%
Assets/Debt
Total Assets $29,764
Total Liabilities $15,000
Net Assets $14,764
Compensation
Key Employees and Officers Compensation Related Other
Stephen Hesterberg Phd (Executive Director) $28,333 $0 $0
Curtis Hemmel (President) $0 $0 $0
Edward Chiles (Vice President) $0 $0 $0
Ernesto Lasso De La Vega Eed (Treasurer) $0 $0 $0
William Arnold Phd (Secretary) $0 $0 $0
Joseph Cannon (Director) $0 $0 $0
Elizabeth Moore (Director) $0 $0 $0
Jefferey Sedacca (Director) $0 $0 $0
Joshua Patterson (Director) $0 $0 $0
Dan Fitz Patrick (Director) $0 $0 $0
Brian Roegger (Director) $0 $0 $0
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Document Links

990
Filed on May 1, 2025

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
XML

Fiscal Year Ending Dec.
2022

Extracted Financial Data

Extracted Financial Data from 990-EZ
Revenue
$82,864
Expenses
$103,144
Net Income
-$20,280
Net Assets
$7,783
Notable Sources of Revenue Percent of Total Revenue
Contributions $82,864
100%
Program Services $0
Investment Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Assets/Debt
Total Assets $17,783
Total Liabilities $10,000
Net Assets $7,783
Compensation
Key Employees and Officers Compensation Other
Stephen Hesterberg Phd (Executive Director) $56,000 $0
Curtis Hemmel (President) $0 $0
Edward Chiles (Vice President) $0 $0
Ernesto Lasso De La Vega Eed (Treasurer) $0 $0
William Arnold Phd (Secretary) $0 $0
Joseph Cannon (Board Of Director) $0 $0
Elizabeth Moore (Board Of Director) $0 $0
Jefferey Sedacca (Board Of Director) $0 $0
Joshua Patterson (Board Of Director) $0 $0
Dan Fitz Patrick (Board Of Director) $0 $0
Brian Roegger (Board Of Director) $0 $0
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Document Links

990-EZ
Filed on May 12, 2023

Short form tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending Dec.
2021

Extracted Financial Data

Extracted Financial Data from 990-EZ
Revenue
$62,781
Expenses
$50,875
Net Income
$11,906
Net Assets
$28,063
Notable Sources of Revenue Percent of Total Revenue
Contributions $62,781
100%
Program Services $0
Investment Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Assets/Debt
Total Assets $28,063
Total Liabilities $0
Net Assets $28,063
Compensation
Key Employees and Officers Compensation Other
Dinorah Chacin Phd (Acting Executive Director) $33,333 $0
Stephen Hesterberg Phd (Executive Director) $5,000 $0
Curtis Hemmel (President) $0 $0
Edward Grafton Chiles (Vice President) $0 $0
Ernesto Lasso De La Vega Edd (Secretary) $0 $0
William Arnold Phd (Treasurer) $0 $0
Joseph Cannon (Board Of Directors) $0 $0
Elizabeth Moore (Board Of Directors) $0 $0
Joshua Patterson Phd (Board Of Directors) $0 $0
Jeffrey Sedacca (Board Of Directors) $0 $0
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990-EZ
Filed on July 11, 2022

Short form tax return for a nonprofit’s activities, finances, and governance

View Filing
XML

Fiscal Year Ending Dec.
2020

Extracted Financial Data

Extracted Financial Data from 990-EZ
Revenue
$172,108
Expenses
$167,819
Net Income
$4,289
Net Assets
$16,157
Notable Sources of Revenue Percent of Total Revenue
Contributions $159,208
92.5%
Program Services $10,000
5.8%
Investment Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $2,900
1.7%
Assets/Debt
Total Assets $16,157
Total Liabilities $0
Net Assets $16,157
Compensation
Key Employees and Officers Compensation Other
Bruce Barber (Former Executive Director) $78,417 $0
Dinorah Chacin Phd (Acting Executive Director) $50,000 $0
Curt Hemmel (President) $0 $0
Ed Chiles (Vice President) $0 $0
Ernesto Lasso De La Vega Edd (Board Of Directors) $0 $0
William Arnold Phd (Treasurer) $0 $0
Joe Cannon (Board Of Directors) $0 $0
Joshua Patterson Phd (Board Of Directors) $0 $0
Angela Colins Phd (Marine Extension Advisor) $0 $0
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990-EZ
Filed on June 3, 2021

Short form tax return for a nonprofit’s activities, finances, and governance

View Filing
XML

Fiscal Year Ending Dec.
2019

Extracted Financial Data

Extracted Financial Data from 990-EZ
Revenue
$79,679
Expenses
$101,338
Net Income
-$21,659
Net Assets
$11,868
Notable Sources of Revenue Percent of Total Revenue
Contributions $68,687
86.2%
Program Services $10,992
13.8%
Investment Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Assets/Debt
Total Assets $11,868
Total Liabilities $0
Net Assets $11,868
Compensation
Key Employees and Officers Compensation Other
Bruce Barber Phd (Executive Director) $51,750 $0
Curt Hemmel (President) $0 $0
Ed Chiles (Vice President) $0 $0
Ernesto Lasso De La Vega Edd (Board Of Directors) $0 $0
William Arnold Phd (Treasurer) $0 $0
Joe Cannon (Board Of Directors) $0 $0
Joshua Patterson Phd (Board Of Directors) $0 $0
Angela Colins Phd (Marine Extension Advisor) $0 $0
Dinorah Chacin Phd (Postdoctoral Research Associate) $0 $0
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Document Links

990-EZ
Filed on March 12, 2020

Short form tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

About This Data

What Is This Data?

Nonprofit Explorer includes summary data for nonprofit tax returns and full Form 990 documents, in both PDF and digital formats.

The summary data contains information processed by the IRS during the 2012-2019 calendar years; this generally consists of filings for the 2011-2018 fiscal years, but may include older records. This data release includes only a subset of what can be found in the full Form 990s.

In addition to the raw summary data, we link to PDFs and digital copies of full Form 990 documents wherever possible. This consists of separate releases by the IRS of Form 990 documents processed by the agency, which we update regularly.

We also link to copies of audits nonprofit organizations that spent $750,000 or more in Federal grant money in a single fiscal year since 2016. These audits are copied from the Federal Audit Clearinghouse.

Which Organizations Are Here?

Every organization that has been recognized as tax exempt by the IRS has to file Form 990 every year, unless they make less than $200,000 in revenue and have less than $500,000 in assets, in which case they have to file form 990-EZ. Organizations making less than $50,000 don’t have to file either form but do have to let the IRS they’re still in business via a Form 990N "e-Postcard."

Nonprofit Explorer has organizations claiming tax exemption in each of the 27 subsections of the 501(c) section of the tax code, and which have filed a Form 990, Form 990EZ or Form 990PF. Taxable trusts and private foundations that are required to file a form 990PF are also included. Small organizations filing a Form 990N "e-Postcard" are not included in this data.

Types of Nonprofits

There are 27 nonprofit designations based on the numbered subsections of section 501(c) of the tax code. See the list »

Get the Data

For those interested in acquiring the original data from the source, here’s where our data comes from:

  • Raw filing data. Includes EINs and summary financials as structured data.
  • Exempt Organization profiles. Includes organization names, addresses, etc. You can merge this with the raw filing data using EIN numbers.
  • Form 990 documents. Prior to 2017, these documents were obtained and processed by Public.Resource.org and ProPublica. Bulk PDF downloads since 2017 are available from the IRS.
  • Form 990 documents as XML files. Includes complete filing data (financial details, names of officers, tax schedules, etc.) in machine-readable format. Only available for electronically filed documents. Electronic data released prior to October 2021 is also available through Amazon Web Services.
  • Audits. PDFs of single or program-specific audits for nonprofit organizations that spent $750,000 or more in Federal grant money in a single fiscal year. Available for fiscal year 2015 and later.

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About Nonprofit Explorer

Nonprofit Explorer

Browse millions of annual returns filed by tax-exempt organizations with ProPublica’s Nonprofit Explorer. See details like executive compensation, revenue, expenses and more. Search for an organization or a person, or search the full text of filings.

By Andrea Suozzo, Alec Glassford, Ash Ngu and Brandon Roberts.

Design by Jeff Frankl. Additional development by Ken Schwencke, Mike Tigas, and Sisi Wei.

E-file viewer adapted from IRS e-File Viewer by Ben Getson. Code for scraping audit documents adapated from Govwiki.

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