Cortney L. Ohs

University of Florida

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i-10 index

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Co-Authors

Matthew A. DiMaggio

University of Florida

Jason S Broach

South Carolina Department of Natural Resources

R. LeRoy Creswell

University of Florida

Louis R. D’Abramo

Mississippi State University

Frank A. Chapman

University of Florida

Scott W. Grabe

University of Florida

Elisa J. Livengood

SUNY Morrisville

Eric J. Cassiano

University of Florida

Amber L. Garr

Florida Atlantic University

Carlos V. Martinez

University of Florida

Cooperative Institutions

University of Florida

Indian River State College

Mississippi State University

Louisiana State University Agricultural Center

Florida Department of Agriculture and Consumer Services

Aquatic Systems (United States)

Auburn University

United States Fish and Wildlife Service

University of Arkansas at Pine Bluff

Southern Illinois University Carbondale

Author Statistics

Papers

Citation

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Determining live prey preferences of larval ornamental marine fish utilizing fluorescent microspheres

Aquaculture (2018)

Isaac S. Lee Cortney L. Ohs Jason S Broach Matthew A. DiMaggio Craig A. Watson

Ichthyoplankton

Trichodina

10.1016/j.aquaculture.2018.01.035

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Citations (14)

Evaluation of nutritional and environmental variables during early larval culture of pigfishOrthopristis chrysoptera(Linnaeus)

Aquaculture Research (2015)

Jason S Broach Cortney L. Ohs Matthew A. DiMaggio Nancy E. Breen

Pigfish (Orthopristis chrysoptera Linnaeus) are a commonly used baitfish in the southeastern United States. Aquaculture methods for broodfish spawning and juvenile grow-out have been developed but there is still a paucity of information regarding larval culture methods. Five, short duration (10 days) experiments were conducted to determine effective strategies to yield high larval survival and growth during early development. Experiment one examined the rotifer enrichments Ori-Green, DHA Protein Selco, and AlgaMac 3050 as well as a non-enriched control along with corresponding fatty acid levels in the enriched rotifers and pigfish larvae. Experiment two evaluated three, once daily feeding frequencies of either 5, 10 or 20 rotifers mL−1. Experiment three compared feeding 20 rotifers mL−1 once daily to feeding 5 rotifers mL−1 twice daily. Experiment four examined four different larval stocking densities: 50, 75, 100, or 125 larvae L−1. Experiment five examined green water strategies using either live Tahitian strain Isochrysis galbana (Parke) or Nannochloropsis oculata (Hibberd) paste at either 250 000 or 500 000 cells mL−1 as well as a clear water control. Results indicated rotifer enrichment with DHA Protein Selco and green water application using live T-ISO at 500 000 cells mL−1 had the highest survival of pigfish during early stages of larval culture. A once daily rotifer feeding regime of 20 rotifers mL−1 and stocking density of 50 larvae L−1 also improved survival. These results provide producers with methods to improve efficiency for pigfish larval culture and provide researchers with new foundational data, such as potential fatty acid requirements.

Live food

Broodstock

Isochrysis galbana

10.1111/are.12891

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Citations (6)

Teach Aquaculture Curriculum: Dancing with Brine Shrimp

EDIS (2010)

Elisa J. Livengood Cortney L. Ohs Amber L. Garr R. LeRoy Creswell Carlos V. Martinez

FA176, a 7-page activity by Elisa J. Livengood, Cortney L. Ohs, Amber L. Garr, R. Leroy Creswell, Carlos V. Martinez, Craig S. Kasper, Brian E. Myers, and Frank A. Chapman, is activity 14 of the Teach Aquaculture Curriculum. In this activity for grades 5-12, students will hatch and culture brine shrimp to observe the behavior and the different development stages of the organisms. Includes student performance standards. Published by the UF School of Forest Resources and Conservation, Program in Fisheries and Aquatic Sciences, July 2010. FA176/FA176: Teach Aquaculture Curriculum: Dancing with Brine Shrimp (ufl.edu)

Brine shrimp

Brine

10.32473/edis-fa176-2010

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Citations (0)

Candidate Species for Florida Aquaculture: Discus Symphysodon spp., a Profitable but Challenging Species for Florida Aquaculture

EDIS (2010)

Elisa J. Livengood Cortney L. Ohs Frank A. Chapman

FA166, an 8-page illustrated fact sheet by E. J. Livengood, C. L. Ohs, and F. A. Chapman, provides an overview of this disc-shaped freshwater chiclid fish — description, habitat and feeding, conservation issues, taxonomy, genetics and domestication, culture methods, and markets. Includes references. Published by the UF Program in Fisheries and Aquatic Sciences, School of Forest Resources and Conservation, December 2009. FA166/FA166: Candidate Species for Florida Aquaculture: Discus Symphysodon spp., a Profitable but Challenging Species for Florida Aquaculture (ufl.edu)

10.32473/edis-fa166-2009

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Citations (14)

Candidate Species for Florida Aquaculture: Atlantic Croaker, Micropogonias undulatus

EDIS (2007)

R. LeRoy Creswell Cortney L. Ohs Christian L. Miller

FA 148, a 5-page illustrated fact sheet by R. LeRoy Creswell, Cortney L. Ohs, and Christian L. Miller, describes this medium-sized fish of the drum family, its culture methods, and summarizes its potential for aquaculture in Florida. Includes references. Published by the UF Department of Fisheries and Aquatic Sciences, May 2007. FA 148/FA148: Candidate Species for Florida Aquaculture: Atlantic Croaker, Micropogonias undulatus (ufl.edu)

Miller

10.32473/edis-fa148-2007

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Citations (3)

Captive Volitional Spawning and Larval Rearing of Pigfish

North American Journal of Aquaculture (2012)

Matthew A. DiMaggio Jason S Broach Cortney L. Ohs Scott W. Grabe

Abstract Pigfish Orthopristis chrysoptera have been identified as a species with potential for commercial production; however, lack of established culture protocols remain a major obstacle. To date, there is no scientific literature that adequately examines captive spawning and culture of this species. The purpose of this study was to evaluate volitional spawning and larval culture of Pigfish. Additionally, a preliminary larval feeding regime was investigated and growth and development of Pigfish larvae were documented. A fecundity of 1,147,149 eggs per female (2,959 eggs/g body weight) was calculated based on 58 recorded volitional spawning events. Larval survival ranged from 6.5% to 100% through 25-d posthatch (DPH). Larvae were observed to initiate swim bladder inflation by 9 DPH, and 100% percent of larvae exhibited notochord flexion by 19 DPH. An effective feeding regime was established that incorporated the nauplii of the copepod Pseudodiaptomus pelagicus, the rotifer Brachionus plicatilis, and Artemia. This study represents the first published report of repeated captive volitional spawning of Pigfish with successful protracted larval rearing.

10.1080/15222055.2012.736447

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Citations (10)

Teach Aquaculture Curriculum: Introduction

EDIS (2010)

Cortney L. Ohs R. LeRoy Creswell Amber L. Garr Carlos V. Martinez Brian E. Myers

FA177, a 2-page fact sheet by Cortney L. Ohs, R. Leroy Creswell, Amber L. Garr, Carlos V. Martinez, Brian E. Myers, Elisa J. Livengood, Craig S. Kasper, and Frank A. Chapman, introduces the Teach Aquaculture Curriculum. The curriculum is designed to engage students in aquaculture and the aquatic sciences through a series of hands-on activities involving all the sciences, mathematics, reading, and writing. Each activity in the series includes student performance standards. Published by the UF School of Forest Resources and Conservation, Program in Fisheries and Aquatic Sciences, July 2010. FA177/FA177: Teach Aquaculture Curriculum: Introduction (ufl.edu)

10.32473/edis-fa177-2010

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Citations (0)

Stress Survival in Larvae of Florida Pompano (Trachinotus carolinus) Fed Enriched Rotifers (Brachionus plicatilis) and Nauplii of the Calanoid Copepod (Pseudodiaptomus pelagicus)

Israeli Journal of Aquaculture - Bamidgeh (2012)

Eric J. Cassiano Cortney L. Ohs Matthew A. DiMaggio

The Florida pompano, Trachinotus carolinus, is a highly prized marine fish whose larviculture includes the feeding of live rotifers and brine shrimp nauplii. In a previous study, growth and survival of pompano larvae fed nauplii of the calanoid copepod, Pseudodiaptomus pelagicus, were compared to those of larvae fed enriched rotifers, Brachionus plicatilis. There were advantages to including the copepod in the larvae diet. The current study examines the stress tolerance of such larvae. Two trials were conducted: for seven (trial 1) and nine (trial 2) days post-hatch. Larvae were fed diets that included enriched rotifers and/or P. pelagicus nauplii and subjected to varying durations of air exposure (‘sieve stress’). Larvae fed copepods exhibited significantly greater stress tolerance than larvae fed only enriched rotifers. In trial 1, stress tolerance increased as the number of days on which copepods were fed increased. It is possible that stress tolerance improved because of a better nutritional profile of the copepod nauplii.

Brachionus

Brine shrimp

10.46989/001c.20613

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Citations (3)

Effect of Dietary Administration of 17α‐methyltestosterone on the Sex Ratio of Postlarval Freshwater Prawn, Macrobrachium rosenbergii, During the Nursery Stage of Culture

Journal of the World Aquaculture Society (2006)

Cortney L. Ohs Louis R. D’Abramo Anita M. Kelly

Macrobrachium rosenbergii

Methyltestosterone

Macrobrachium

10.1111/j.1749-7345.2006.00045.x

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Citations (10)

Evaluation of a Point‐of‐Care Blood Analyzer for Use in Determination of Select Hematological Indices in the Seminole Killifish

North American Journal of Aquaculture (2010)

Matthew A. DiMaggio Cortney L. Ohs B. Denise Petty

Abstract Conventional methodologies for hematological analysis are gradually being replaced with new technologies. Point-of-care blood analyzers are both efficient and user friendly. As the use of such technologies becomes more pervasive in current literature, investigations into the accuracy and reliability of point-of-care analyzers for evaluating fish hematological indices are warranted. The purpose of this study was to evaluate a point-of-care blood analyzer (i-STAT®) and chosen cartridge (E3+) against conventionally accepted instrumentation (CAI) for use in determination of hematocrit, sodium, potassium, and chloride values in Seminole killifish Fundulus seminolis. Whole blood, a whole-blood heparin dilution, and undiluted plasma were analyzed in the point-of-care unit to determine hematological parameters of interest. The Bland–Altman method for assessing agreement between two methods of clinical measurement was used as well as calculations of correlation coefficients and two-tailed paired Student's t-tests. Generally, mean values obtained from CAI were higher than those from the i-STAT using whole blood, heparin-diluted blood, and plasma. Significant differences (P ≤ 0.05) were observed between all means analyzed by t-tests. When compared with CAI results, none of the blood index values generated by the i-STAT in these experiments could be considered reliable.

Killifish

Point of care

10.1577/a09-067.1

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Citations (15)