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Full-Text Articles in Aquaculture and Fisheries

Developmental And Functional Analysis Of Scutes In The Armored Catfish Corydoras Aeneus, Emily Volk Jan 2019

Developmental And Functional Analysis Of Scutes In The Armored Catfish Corydoras Aeneus, Emily Volk

Undergraduate Honors Theses

Fish scales are specialized biological structures of current interest in innovative materials design because of the combination of protective function, flexibility, and light weight they offer. This study presents a developmental and functional investigation of a particular fish scale structure, the scutes (bony external plates) of the armored Bronze Corydoras Catfish (Corydoras aeneus). Scutes in this model fish species were analyzed via three complementary approaches. First, scutes were documented throughout fish development via high-quality microscope images. These images were subsequently used to inform fabrication of synthetic models to characterize the relationship between scute overlap and overall bending stiffness of scute ...


Your Catch Of The Day Could Be Your Catch Next Week: Angler's Interactions With The Trout Populations Of Northeast Colorado, Melissa Merritt Jan 2018

Your Catch Of The Day Could Be Your Catch Next Week: Angler's Interactions With The Trout Populations Of Northeast Colorado, Melissa Merritt

Undergraduate Honors Theses

This research project is an analysis of catch-and-release fishing near Boulder, Colorado. Catch-and-release is a conservation practice, common among anglers, which requires anglers to return fish to the water after capture with no harm done or as little harm as possible. This study focuses on voluntary catch-and-release during fly fishing. The first research question is: What are the conservation effects of catch-and-release angling on healthy trout populations? The methods employed to answer this question involved reviewing past literature and studies on catch-and-release for various trout populations. This review showed that there are remarkable inconsistencies in research methods and results. Further ...


Continuing Improvements Of The Sharkduino Animal Tag System, William Laney Dec 2017

Continuing Improvements Of The Sharkduino Animal Tag System, William Laney

Undergraduate Honors Theses

Much about the movement and habits of marine animals is still unknown. This information can be found for terrestrial animals through direct observation or video surveillance; however, these optical methods are not effective in aquatic environments. To circumvent this problem, researchers “tag” aquatic animals with small sensor systems that record data about the animals movements. The researchers then recover the tag and use signal analysis to draw conclusions about the habits of the animal. Unfortunately, commercially available tags are expensive and most can only be used once. We created an inexpensive and reusable tag to be used on sandbar sharks ...


Juvenile Blue Crab (Callinectes Sapidus) Survival In Simulated Seagrass Habitats (Zostera Marina And Ruppia Maritima), Kylie Smith Jan 2017

Juvenile Blue Crab (Callinectes Sapidus) Survival In Simulated Seagrass Habitats (Zostera Marina And Ruppia Maritima), Kylie Smith

Undergraduate Honors Theses

Anthropogenic increases in global temperatures and nutrient loads are expected to reduce juvenile blue crab (Callinectes sapidus) survival in the Chesapeake Bay. These factors change habitat composition which can affect juvenile invertebrates and fishes that are dependent on these habitats. Eelgrass (Zostera marina) is declining due to rising water temperatures and increased nutrient loading, while widgeon grass (Ruppia maritima) can tolerate higher temperatures. An indoor mesocosm experiment was designed to test the suitability of Zostera and Ruppia as protective nursery habitats compared to sand. Artificial seagrass plots were placed in flow-through tanks. Juvenile blue crabs were tethered, and adult blue ...


Physical Modeling Of Vortical Cross-Step Filtration In The Oral Cavity Of American Paddlefish (Polyodon Spathula), Hannah Brooks May 2016

Physical Modeling Of Vortical Cross-Step Filtration In The Oral Cavity Of American Paddlefish (Polyodon Spathula), Hannah Brooks

Undergraduate Honors Theses

This thesis explores the filter-feeding mechanisms of the American paddlefish, Polyodon spathula. The data indicate that paddlefish use a filtration method termed cross-step filtration, which utilizes vortices formed behind the branchial arches by the incoming water flow. Videos of these vortices were obtained and quantified for the first time inside the oral cavities of preserved paddlefish. Since the paddlefish can move the branchial arches within the oral cavity, the effects of changing branchial arch angle on vortex characteristics were studied in 3D models. The vortices in three models with different arch angles were quantified. The data demonstrated that a change ...


The Consumption Of Lionfish As A Control Of An Invasive Species In Bermuda, Alaire Davis Jan 2016

The Consumption Of Lionfish As A Control Of An Invasive Species In Bermuda, Alaire Davis

Undergraduate Honors Theses

This research focuses on how lionfish are affecting the waters of the Caribbean Sea and western Atlantic Ocean, and the practices in place to control the lionfish invasion. The presence of lionfish in these areas is a significant problem because of the detrimental effect they have on coral reef ecosystems. Countries in the Atlantic that are directly dependent on underwater ecosystems for their economy, and the global underwater environment in general, are at risk. My research aimed to determine if consuming lionfish can be a viable way of reducing lionfish in Bermuda. I approached this question by surveying three categories ...


Ingestion Of Low Density Food Particles By Suspension-Feeding Goldfish, Kristin Edwards Dec 2015

Ingestion Of Low Density Food Particles By Suspension-Feeding Goldfish, Kristin Edwards

Undergraduate Honors Theses

Goldfish (Carassius auratus) are known to be suspension-feeders that use crossflow filtration to filter out extremely small food particles from the water. In this study, I investigated whether goldfish could feed on low-density food particles and also tried to identify any feeding behaviors or morphological traits that could be involved in this mechanism. I conducted feeding experiments with various novel and familiar food types that were followed up by gut content analysis to confirm ingestion of the low-density particles. I also observed and quantified by counting three behaviors associated with this feeding mechanism and performed statistical analyses to look for ...


Association Between Invasive Lionfish And Native Fish Species In The Western Atlantic And Caribbean, Erin T. Spencer May 2014

Association Between Invasive Lionfish And Native Fish Species In The Western Atlantic And Caribbean, Erin T. Spencer

Undergraduate Honors Theses

Lionfish (genus Pterois) are a carnivorous, venomous fish native to the Indo-Pacific that are now invasive in the Western Atlantic, Caribbean, and Gulf of Mexico. They are extremely adaptable, eat a wide variety of native fish species, and are prolific breeders. The rapid infiltration of lionfish into native reef ecosystems have caused the invasion to be recognized as one of the world’s top conservation issues.

Since 1990, the Reef Environmental Education Foundation (REEF) has employed widespread fish count program that educates divers about fish identification and collects citizen data in an extensive database. I utilized this data to illustrate ...


Smooth Hammerhead Target Fishing And By-Catch In Puerto López, Ecuador: Trends In Catch And Recommendations For Mitigation, Lauren E. Degeorge Jan 2014

Smooth Hammerhead Target Fishing And By-Catch In Puerto López, Ecuador: Trends In Catch And Recommendations For Mitigation, Lauren E. Degeorge

Undergraduate Honors Theses

Sharks have not historically been considered a valuable resource but, with the increase in demand for their fins, shark catch numbers have risen dramatically and many shark populations are suffering. It is difficult to know the extent of the problem because there is a lack of information about sharks and shark catch is vastly under-reported. The smooth hammerhead shark (Sphyrna zygaena) is valuable in the shark fin market for its eight, large fins and is frequently landed at the Puerto López fish market in Ecuador. EquililbrioAzul is a marine conservation organization that has been keeping track of shark catch in ...