Cortney L. Ohs

0000-0002-6545-2388

Candidate Species for Florida Aquaculture: Hybrid Striped Bass, Morone saxatilis x Morone chrysops

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

This publication describes these crosses between striped bass and white bass, commonly called sunshine bass and palmetto bass — geographical distribution and habitat, phases of production, pond, cage, and tank production, feeding, water quality, and marketing.

Teach Aquaculture Curriculum: Introduction

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

Teach Aquaculture Curriculum: What makes a good fish food?

Craig S. Kasper, Cortney L. Ohs, Brian E. Myers, Frank A. Chapman, Amber L. Garr, R. Leroy Creswell, Carlos V. Martinez, and Elisa J. Livengood

Using Airlifts to Collect and Concentrate Copepod Nauplii

Eric Cassiano, Matthew DiMaggio, Cortney Ohs, and John Marcellus

Airlifts are simple and inexpensive and not new to aquaculture. The buoyancy of rising bubbles within a pipe or tube generates an upward flow of water that are often used as part of water treatment design in recirculating aquaculture systems, but can also be used to collect and concentrate live food organisms fed to marine fish larvae. Airlifts are more gentle and efficient than sieving. This 3-page fact sheet provides protocols and designs for harvesting and feeding copepod nauplii to marine fish larvae, but these methods can be adapted for use with many live feed organisms.

Teach Aquaculture Curriculum: Dancing with Brine Shrimp

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

Brine shrimp live in and are harvested primarily from natural salt lakes and solar salt operations around the world. Two natural sources of brine shrimp in the United States are the Great Salt Lake in Utah and San Francisco Bay in California. Adult brine shrimp are also called "sea monkeys" and are used for entertainment or to feed aquarium fish. Brine shrimp can be used to observe, control, and manipulate a life cycle under laboratory conditions during a period of less than 2 weeks. They can be

Candidate Species for Florida Aquaculture: Gulf Killifish, Fundulus grandis

Shane W. Ramee, Joshua T. Patterson, Cortney L. Ohs, and Matthew A. DiMaggio

Aquaculture Applications of the Family Gobiidae

Jesse Von Linden, Joshua T. Patterson, Cortney L. Ohs, and Matthew A. DiMaggio

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

E. J. Livengood, C. L. Ohs, and F. A. Chapman

Candidate Species for Florida Aquaculture: Pinfish, Lagodon rhomboides

Cortney L. Ohs, Scott W. Grabe, and Matthew A. DiMaggio

Teach Aquaculture Curriculum: Chlorine—Friend or Foe?

Carlos V. Martinez, Cortney L. Ohs, Brian E. Myers, Elisa J. Livengood, Craig S. Kasper, Amber L. Garr, R. Leroy Creswell, and Frank A. Chapman

Design and Operation of Egg Collectors for Pelagic Spawning Marine Fishes

Cortney Ohs, John Marcellus, Eric Cassiano, and Jason Broach

A significant limitation in developing aquaculture protocols for marine fish species is an adequate understanding of viable egg production and larval development. The first step in that process is to efficiently collect fertilized embryos, usually referred to as eggs, for examination and further development. This fact sheet includes directions for construction and operation of two types of pelagic egg collectors: pre-filter and floating airlift.

Choosing an Appropriate Live Feed for Larviculture of Marine Fish

Cortney L. Ohs, Eric J. Cassiano, and Adelaide Rhodes

This publication discusses the pros and cons of using rotifers, brine shrimp, and copepods as live food for marine fish larvae.

Teach Aquaculture Curriculum: Fish-Eating Contest

Amber L. Garr, Cortney L. Ohs, Brian E. Myers, Craig S. Kasper, R. Leroy Creswell, Frank A. Chapman, Carlos V. Martinez, and Elisa J. Livengood

There are numerous fish species cultured in the world. Fish are cultured in ponds, tanks, and cages. Some are fed floating, pelleted food and some consume live algae. The types of diets used in aquaculture have been developed specifically for the feeding strategies of the cultured animal. In this lesson, students will mimic fish with different mouth positions by adopting different feeding behaviors and by trying to capture marshmallows without the use of their hands.

Candidate Species for Florida Aquaculture: Atlantic Croaker, Micropogonias undulatus

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

Teach Aquaculture Curriculum: Spawning and Rearing Bivalve Molluscs—Larval Culture

R. Leroy Creswell, Cortney L. Ohs, Craig S. Kasper, Carlos V. Martinez, Elisa J. Livengood, Amber L. Garr, Frank A. Chapman, and Brian E. Myers

In this activity students will use an ocular micrometer to measure the length of bivalve larvae, monitor the density of larvae in their culture system, and understand production protocols used in bivalve hatcheries. This activity will take about 15 minutes per day for approximately two weeks; this is the amount of time it will take for larvae to develop from egg to metamorphosis (setting).

Teach Aquaculture Curriculum: Spawning and Rearing Bivalve Molluscs—Spawning

R. Leroy Creswell, Cortney L. Ohs, Craig S. Kasper, Elisa J. Livengood, Amber L. Garr, Brian E. Myers, Carlos V. Martinez, and Frank A. Chapman

Candidate Species for Florida Aquaculture: Caribbean Spiny Lobster, Panulirus argus

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

Aquaculture Applications of the Family Blenniidae

Jesse Von Linden, Joshua T. Patterson, Cortney L. Ohs, and Matthew A. DiMaggio

Candidate Species for Florida Aquaculture: Pigfish, Orthropristis chrysoptera

Eric J. Cassiano, Cortney L. Ohs, and Jeff E. Hill

Storage of Decapsulated Artemia (Brine Shrimp)

Jason Broach, Cortney Ohs, and Isaac Lee

Artemia (brine shrimp) are good food for larval fish, but they have to be removed from their shells before many species can eat them. The process can be time- and labor-intensive, especially since it is often performed every day. Fortunately, this fact sheet describes a method for storing a 7-day supply of the brine shrimp that will allow the task to be done just once a week.

Teach Aquaculture Curriculum: How big is that pond?

Cortney L. Ohs, Amber L. Garr, R. Leroy Creswell, Elisa J. Livengood, Brian E. Myers, Carlos V. Martinez, Frank A. Chapman, and Craig S. Kasper

This activity will provide examples of volume and area calculations of ponds of various types and shapes. The students will learn to calculate volumes and surface areas of ponds and use this information to calculate stocking densities and chemical application rates. Students will be able to make these calculations in both US and metric units. This activity has direct application to aquaculture, and these calculations are commonly used by federal and state agencies, private companies, engineers, toxicologists, and other people related to the aquatic sciences.

Candidate Species for Florida Aquaculture: Arapaima Arapaima gigas

Cortney L. Ohs, Jeffrey E. Hill, Sarah E. Wright, H. Mae Giddings, and Allison L. Durland Donahou

Arapaima Arapaima gigas, also known as paiche and pirarucu, is a large South American freshwater fish with unique biology, favorable aquaculture characteristics, and potential for production in south Florida. This publication provides Arapaima gigas biology, specific culture methods known for each stage of development, and information about diseases and parasites, markets, and the laws associated with this species to potential Florida producers.

Candidate Species for Florida Aquaculture: American Horseshoe Crab Limulus polyphemus

Lena Donnarumma, Brittany J. Scharf, Jeffrey E. Hill, and Cortney L. Ohs

The American horseshoe crab, Limulus polyphemus, is a member of the phylum Arthropoda, subphylum Chelicerata, and class Merostomata. Although there are four horseshoe crab species worldwide, the American horseshoe crab is primarily found in the Atlantic Ocean along the East Coast of North America. The species ranges from Maine to Mexico, but is absent between Texas in the United States and Tabasco in Mexico. They mainly inhabit estuarine areas; however, juveniles and adults can venture into the shallow oceanic environments. Embryo development occurs in the intertidal zone of sandy beaches. Sandy or muddy bottom habitats are necessary for burrowing and benthic feeding. This publication will cover their natural history, aquaculture techniques, common diseases, and their uses and markets.  

Florida Marine Baitfish Aquaculture Series – Part 1: Marketing Opportunities and Challenges

Marissa Drake, Andrew Ropicki, Matthew A. DiMaggio, Kelly Grogan, Cortney L. Ohs, Laura Tiu, Edward V. Camp, and Jordan Moor

This publication, Part 1 in the Florida Marine Baitfish Aquaculture series, outlines opportunities and challenges associated with marketing aquacultured live marine baitfish in Florida. It examines why Florida is uniquely suited for the continued development of this industry, reviews the marine recreational angling baitfish market, and describes the opportunities and challenges associated with marine baitfish marketing and selling live baitfish to marine baitfish retailers. This publication is intended to provide information to current and potential farmers, as well as management agency and outreach personnel and the interested public. It should help farmers, potential farmers, and perhaps investors understand the potential scale, opportunities, and challenges of live baitfish aquaculture in Florida. This same information can assist policymakers and outreach personnel in their management decisions and the communications of those decisions.

Candidate Species for Florida Aquaculture: Almaco Jack, Seriola rivoliana

Victor Blanco, Cortney Ohs, Nicole Rhody, and Ronald Hans

Almaco jack, Seriola rivoliana, is a perciform within the order Perciformes, family Carangidae; which includes jacks and pompanos. They are members of the genus Seriola, a species of interest for aquaculture diversification worldwide. Like other commercially farmed Seriola species, almaco jack (also known as longfin yellowtail and kampachi) are fast growers, have a high market value, and are increasingly well-regarded among chefs for their versatility in both cooked and raw preparations. These characteristics, among others, have made them favorable candidates for both land-based and offshore aquaculture.

Teach Aquaculture Curriculum: Anatomy of a Fish

Amber L. Garr, Cortney L. Ohs, Craig S. Kasper, R. Leroy Creswell, Frank A. Chapman, Brian E. Myers, Elisa J. Livengood, and Carlos V. Martinez

A UF/IFAS numbered Curriculum. Published by Aquaculture

Candidate Species for Florida Aquaculture: Evaluating an Aquatic Organism's Aquaculture Potential

Cortney L. Ohs and R. LeRoy Creswell

A UF/IFAS numbered Fact Sheet. Published by Aquaculture