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Article ; Online: Seasonal Dynamics and Environmental Drivers of Goliath Grouper ( Epinephelus itajara ) Sound Production

Lauran R. Brewster / Ali K. Ibrahim / James Locascio / Breanna C. DeGroot / Laurent M. Chérubin / Matthew J. Ajemian

Fishes, Vol 8, Iss 293, p

2023 Volume 293

Abstract: The Goliath groupers are known to produce characteristic low frequency vocalizations (“calls”) during spawning aggregations and as part of territorial behavior. Acoustic monitoring for Goliath grouper calls around Florida has historically occurred ... ...

Abstract	The Goliath groupers are known to produce characteristic low frequency vocalizations (“calls”) during spawning aggregations and as part of territorial behavior. Acoustic monitoring for Goliath grouper calls around Florida has historically occurred between July and December to capture the spawning season, with a particular focus on August–November. Because of the unique waveform of the Goliath grouper call, we implemented a noise adaptive matched filter to automatically detect Goliath grouper calls from year-round passive acoustic recordings at two wrecks off Florida’s Gulf of Mexico coast. We investigated diel, temporal and environmental factors that could influence call rates throughout the year. Call rates peaked in August, around 0300 EST and just after the full moon. The Goliath groupers were more vocal when background noise was between 70 and 110 dB re 1 µPa. An additional smaller peak in call rates was identified in May, outside of the typical recording period, suggesting there may be other stimuli besides spawning that are eliciting high sound production in this species. Goliath grouper sound production was present year-round, indicative of consistent communication between individuals outside the spawning season.
Keywords	passive acoustics ; fish acoustics ; soniferous ; match filter ; lunar cycle ; Biology (General) ; QH301-705.5 ; Genetics ; QH426-470
Subject code	590
Language	English
Publishing date	2023-06-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Visitation patterns of two ray mesopredators at shellfish aquaculture leases in the Indian River Lagoon, Florida.

Brianna V Cahill / Breanna C DeGroot / Lauran R Brewster / Steven M Lombardo / Charles W Bangley / Matthew B Ogburn / Matthew J Ajemian

PLoS ONE, Vol 18, Iss 5, p e

2023 Volume 0285390

Abstract: The Indian River Lagoon is a primary location of field-based "grow-out" for bivalve shellfish aquaculture along Florida's Atlantic coast. Grow-out locations have substantially higher clam densities than surrounding ambient sediment, potentially ... ...

Abstract	The Indian River Lagoon is a primary location of field-based "grow-out" for bivalve shellfish aquaculture along Florida's Atlantic coast. Grow-out locations have substantially higher clam densities than surrounding ambient sediment, potentially attracting mollusk predators to the area. Inspired by clammer reports of damaged grow-out gear, we used passive acoustic telemetry to examine the potential interactions between two highly mobile invertivores-whitespotted eagle rays (Aetobatus narinari) and cownose rays (Rhinoptera spp.)-and two clam lease sites in Sebastian, FL and compared these to nearby reference sites (Saint Sebastian River mouth, Sebastian Inlet) from 01 June 2017 to 31 May 2019. Clam lease detections accounted for 11.3% and 5.6% of total detections within the study period, for cownose and whitespotted eagle rays, respectively. Overall, the inlet sites logged the highest proportion of detections for whitespotted eagle rays (85.6%), while cownose rays (11.1%) did not use the inlet region extensively. However, both species had significantly more detections at the inlet receivers during the day, and on the lagoon receivers during the night. Both species exhibited long duration visits (> 17.1 min) to clam lease sites, with the longest visit being 387.5 min. These visit durations did not vary substantially between species, although there was individual variability. Based on generalized additive mixed models, longer visits were observed around 1000 and 1800 h for cownose and whitespotted eagle rays, respectively. Since 84% of all visits were from whitespotted eagle rays and these longer visits were significantly longer at night, this information suggests that observed interactions with the clam leases are potentially underestimated, given most clamming operations occur during daytime (i.e., morning). These results justify the need for continued monitoring of mobile invertivores in the region, including additional experimentation to assess behaviors (e.g., foraging) exhibited at the clam lease sites.
Keywords	Medicine ; R ; Science ; Q
Subject code	333
Language	English
Publishing date	2023-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Habitat-specific performance of vertical line gear in the western Gulf of Mexico: A comparison between artificial and natural habitats using a paired video approach

Streich, Matthew K / Matthew J. Ajemian / Jennifer J. Wetz / Gregory W. Stunz

Fisheries research. 2018 Aug., v. 204

2018

Abstract: Gear performance is often assumed to be constant over various conditions encountered during sampling; however, this assumption is rarely verified and has the potential to introduce bias. We used fishery-independent vertical line surveys to evaluate ... ...

Abstract	Gear performance is often assumed to be constant over various conditions encountered during sampling; however, this assumption is rarely verified and has the potential to introduce bias. We used fishery-independent vertical line surveys to evaluate whether gear efficiency and selectivity is similar while assessing reef fish populations at oil and gas platforms, artificial reefs, and natural banks in the western Gulf of Mexico. We conducted 192 vertical line sets with cameras placed on a subset of these deployments to validate any differences in efficiency among habitat types. Red snapper (Lutjanus campechanus) accounted for 93% of the catch. No difference in red snapper CPUE among habitats was detected. When evaluating fish size, 8/0 and 11/0 hooks sampled significantly larger red snapper at natural banks than at artificial habitats. While CPUE was similar among all hooks at artificial habitats, CPUE at natural banks was lower for shallower hooks and increased towards the bottom hooks along the backbone. At all habitats, red snapper TL decreased from shallow to deep hook positions. Simultaneous camera deployments revealed other processes affecting efficiency such as bait removal and depredation. Vermilion snapper (Rhomboplites aurorubens) were effective at removing bait while avoiding capture. Perhaps related to this observation, Red snapper CPUE was negatively correlated with the vermilion snapper video index of abundance. Video confirmed gear saturation was prevalent (70% of deployments), occurring more frequently on artificial habitats. Furthermore, the time fished was effectively “shorter” at artificial habitats as the number of available baited hooks declined rapidly. These results point towards higher relative abundance at artificial habitats; however, the prevalence of saturation indicates vertical line CPUE may not always be proportional to true abundance, hindering our ability to detect differences at the scale examined in this study. Vertical line surveys should evaluate the prevalence of saturation as inferences regarding relative abundance may be compromised when this information is unknown.
Keywords	Lutjanus campechanus ; Rhomboplites aurorubens ; aquacultural and fisheries equipment ; artificial reefs ; cameras ; fish ; fish communities ; habitats ; oils ; surveys ; Gulf of Mexico
Language	English
Dates of publication	2018-08
Size	p. 16-25.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	406532-3
ISSN	0165-7836
ISSN	0165-7836
DOI	10.1016/j.fishres.2018.01.018
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Distribution and dynamic habitat use of young bull sharks Carcharhinus leucas in a highly stratified northern Gulf of Mexico estuary.

J Marcus Drymon / Matthew J Ajemian / Sean P Powers

PLoS ONE, Vol 9, Iss 5, p e

2014 Volume 97124

Abstract: Understanding how animals alter habitat use in response to changing abiotic conditions is important for effective conservation management. For bull sharks (Carcharhinus leucas), habitat use has been widely examined in the eastern and western Gulf of ... ...

Abstract	Understanding how animals alter habitat use in response to changing abiotic conditions is important for effective conservation management. For bull sharks (Carcharhinus leucas), habitat use has been widely examined in the eastern and western Gulf of Mexico; however, knowledge of their movements and the factors influencing them is lacking for populations in the more temperate north-central Gulf of Mexico. To examine how changes in hydrographic conditions affected the presence of young bull sharks in Mobile Bay, Alabama, thirty-five sharks were fitted with internal acoustic transmitters and monitored with an acoustic monitoring array consisting of thirty-three receivers between June 2009 and December 2010. Tagged sharks ranged in size from 60 to 114 cm fork length and were detected between the upper and lower portions of Mobile Bay. Despite a variety of freshwater sources associated with this highly productive estuary, sharks were most consistently detected at the largest input to the system--the Mobile and Tensaw Rivers. Our findings suggest a combination of hydrographic factors interact to influence the distribution of juvenile bull sharks in Mobile Bay. The factors affecting the probability of detecting at least one bull shark varied both temporally (2009 vs 2010) and spatially (upper vs lower bay). Electivity analysis demonstrated that bull sharks showed highest affinity for warm water (29-32 °C), moderate salinities (10-11 psu) and normoxic waters (5-7 mg/l), although these patterns were not consistent between regions or across years. We suggest future studies coupling telemetry and hydrographic variables should, when possible, consider the interactions of multiple environmental parameters when defining the dynamic factors explaining the spatial distribution of coastal sharks.
Keywords	Medicine ; R ; Science ; Q
Subject code	910
Language	English
Publishing date	2014-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Movement patterns and habitat use of tiger sharks (Galeocerdo cuvier) across ontogeny in the Gulf of Mexico.

Matthew J Ajemian / J Marcus Drymon / Neil Hammerschlag / R J David Wells / Garrett Street / Brett Falterman / Jennifer A McKinney / William B Driggers / Eric R Hoffmayer / Christopher Fischer / Gregory W Stunz

PLoS ONE, Vol 15, Iss 7, p e

2020 Volume 0234868

Abstract: The tiger shark (Galeocerdo cuvier) is globally distributed with established coastal and open-ocean movement patterns in many portions of its range. While all life stages of tiger sharks are known to occur in the Gulf of Mexico (GoM), variability in ... ...

Abstract	The tiger shark (Galeocerdo cuvier) is globally distributed with established coastal and open-ocean movement patterns in many portions of its range. While all life stages of tiger sharks are known to occur in the Gulf of Mexico (GoM), variability in habitat use and movement patterns over ontogeny have never been quantified in this large marine ecosystem. To address this data gap we fitted 56 tiger sharks with Smart Position and Temperature transmitting tags between 2010 and 2018 and examined seasonal and spatial distribution patterns across the GoM. Additionally, we analyzed overlap of core habitats (i.e., 50% kernel density estimates) among individuals relative to large benthic features (oil and gas platforms, natural banks, bathymetric breaks). Our analyses revealed significant ontogenetic and seasonal differences in distribution patterns as well as across-shelf (i.e., regional) and sex-linked variability in movement rates. Presumably sub-adult and adult sharks achieved significantly higher movement rates and used off-shelf deeper habitats at greater proportions than juvenile sharks, particularly during the fall and winter seasons. Further, female maximum rate of movement was higher than males when accounting for size. Additionally, we found evidence of core regions encompassing the National Oceanographic and Atmospheric Administration designated Habitat Areas of Particular Concern (i.e., shelf-edge banks) during cooler months, particularly by females, as well as 2,504 oil and gas platforms. These data provide a baseline for future assessments of environmental impacts, such as climate variability or oil spills, on tiger shark movements and distribution in the region. Future research may benefit from combining alternative tracking tools, such as acoustic telemetry and genetic approaches, which can facilitate long-term assessment of the species' movement dynamics and better elucidate the ecological significance of the core habitats identified here.
Keywords	Medicine ; R ; Science ; Q
Subject code	333
Language	English
Publishing date	2020-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Feeding Ecology of Dolphinfish in the Western Gulf of Mexico

Brewton, Rachel A / Gregory W. Stunz / Matthew J. Ajemian / Peter C. Young

Transactions of the American Fisheries Society. 2016 July 3, v. 145, no. 4

2016

Abstract: Dolphinfish Coryphaena hippurus support important commercial and recreational fisheries in the Gulf of Mexico. Understanding the feeding ecology of this economically important pelagic fish is key to its sustainable management; however, dietary data from ... ...

Abstract	Dolphinfish Coryphaena hippurus support important commercial and recreational fisheries in the Gulf of Mexico. Understanding the feeding ecology of this economically important pelagic fish is key to its sustainable management; however, dietary data from this region are sparse. We conducted a comprehensive diet study to develop new trophic baselines and investigate potential ontogenetic and sex-related shifts in Dolphinfish feeding ecology. The stomach contents of 357 Dolphinfish (27.6â148.5 cm TL) were visually examined from fishery-dependent sources off Port Aransas, Texas. Our analyses revealed a highly piscivorous diet with Actinopterygii comprising 70.44% of the stomach contents by number. The most commonly observed taxa were carangid (12.45% N) and tetraodontiform (12.08% N families Balistidae, Monacanthidae, and Tetraodontidae) fishes. Malacostracans were also common (24.83% N), mostly in the form of pelagic megalopae. Other prey categories included squid and the critically endangered Kempâs Ridley sea turtles Lepidochelys kempii . Although increasingly commom in larger fish, Sargassum spp. was found across a range of sizes in Dolphinfish, indicating that these fish feed from this drifting macroalgae throughout ontogeny. An ontogenetic shift from primary consumption of carangids and brachyurans in smaller size-classes to tetraodontids, monocanthids, and squid in larger size-classes was also observed. No sex-related difference in diet was observed. The overall infection rate for gastric parasites was 54%, an order of magnitude increase from that previously reported in the region, but consistent with recent studies from other areas. Trematode parasites in the genus Dinurus were found in 55% of stomachs and nematode parasites of the family Raphidascarididae in 16% of stomachs. Overall, Dolphinfish in the western Gulf of Mexico are highly opportunistic carnivores with a gastrointestinal parasite burden consistent with that reported in other ocean basins. These data will be important for sustainable management of this economically important species. Received November 20, 2015; accepted February 17, 2016 Published online June 24, 2016
Keywords	Balistidae ; basins ; Coryphaena hippurus ; diet study techniques ; fish feeds ; Lepidochelys kempii ; macroalgae ; Monacanthidae ; Nematoda ; ontogeny ; parasites ; pelagic fish ; piscivores ; Sargassum ; sea turtles ; sport fishing ; squid ; stomach ; Tetraodontidae ; Trematoda ; Gulf of Mexico ; Texas
Language	English
Dates of publication	2016-0703
Size	p. 839-853.
Publishing place	Taylor & Francis
Document type	Article
ISSN	1548-8659
DOI	10.1080/00028487.2016.1159614
Database	NAL-Catalogue (AGRICOLA)

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Article: A Comparison of Size Structure, Age, and Growth of Red Snapper from Artificial and Natural Habitats in the Western Gulf of Mexico

Streich, Matthew K / Matthew J. Ajemian / Jennifer J. Wetz / Jason A. Williams / J. Brooke Shipley / Gregory W. Stunz

Transactions of the American Fisheries Society. 2017 July 4, v. 146, no. 4

2017

Abstract: Red Snapper Lutjanus campechanus support economically important fisheries in the Gulf of Mexico (GOM) and have been classified as overfished since the first stock assessment was conducted in 1988. Although the stock is now showing signs of recovery, ... ...

Abstract	Red Snapper Lutjanus campechanus support economically important fisheries in the Gulf of Mexico (GOM) and have been classified as overfished since the first stock assessment was conducted in 1988. Although the stock is now showing signs of recovery, management could benefit from a better understanding of regional or even habitat-level differences in stock demographics, as these dynamics ultimately determine overall stock productivity. From 2012 to 2014, we used a fishery-independent vertical line survey to assess Red Snapper relative abundance, size and age structure, and growth parameters at standing oil and gas platforms, decommissioned platform artificial reefs, and natural banks in the western GOM. We captured 1,170 Red Snapper ranging from 275 to 855 mm TL. Vertical line CPUE data showed no differences among the three habitat types. Ages determined for 1,143 individuals ranged from 2 to 30 years; however, most (90%) were younger than age 8. Size and age frequencies revealed that natural banks supported a greater proportion of large and relatively old fish compared to standing platforms or artificial reefs, although this difference was heavily influenced by a single bank that had significantly larger and older Red Snapper than other sites. Mean age was not significantly different among habitat types. Among a suite of growth models fitted to size-at-age data, the logistic model provided the best fit and suggested that fish from artificial reefs reached larger sizes at age than fish from either standing platforms or natural banks. Our study provides the first estimates of habitat-specific growth parameters for Red Snapper in the western GOM, and this information can benefit future stock assessments. This study also highlights the potential benefits of artificial reefs to Red Snapper and indicates that all habitats could contribute similarly to stock productivity on a per-unit-area basis. Received December 21, 2016; accepted March 14, 2017 Published online May 26, 2017
Keywords	Lutjanus campechanus ; age structure ; artificial reefs ; demographic statistics ; fish ; fisheries ; growth models ; habitats ; logit analysis ; oils ; surveys ; Gulf of Mexico
Language	English
Dates of publication	2017-0704
Size	p. 762-777.
Publishing place	Taylor & Francis
Document type	Article
ISSN	1548-8659
DOI	10.1080/00028487.2017.1308884
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Estimating the potential impacts of large mesopredators on benthic resources

Matthew J Ajemian / Sean P Powers / Thaddeus J T Murdoch

PLoS ONE, Vol 7, Iss 7, p e

integrative assessment of spotted eagle ray foraging ecology in Bermuda.

2012 Volume 40227

Abstract: Declines of large sharks and subsequent release of elasmobranch mesopredators (smaller sharks and rays) may pose problems for marine fisheries management as some mesopredators consume exploitable shellfish species. The spotted eagle ray (Aetobatus ... ...

Abstract	Declines of large sharks and subsequent release of elasmobranch mesopredators (smaller sharks and rays) may pose problems for marine fisheries management as some mesopredators consume exploitable shellfish species. The spotted eagle ray (Aetobatus narinari) is the most abundant inshore elasmobranch in subtropical Bermuda, but its predatory role remains unexamined despite suspected abundance increases and its hypothesized specialization for mollusks. We utilized a combination of acoustic telemetry, benthic invertebrate sampling, gut content analysis and manipulative experiments to assess the impact of spotted eagle rays on Bermudian shellfish resources. Residency and distribution of adult spotted eagle rays was monitored over two consecutive summers in Harrington Sound (HS), an enclosed inshore lagoon that has historically supported multiple recreational and commercial shellfish species. Telemetered rays exhibited variable fidelity (depending on sex) to HS, though generally selected regions that supported relatively high densities of potential mollusk prey. Gut content analysis from rays collected in HS revealed a diet of mainly bivalves and a few gastropods, with calico clam (Macrocallista maculata) representing the most important prey item. Manipulative field and mesocosm experiments with calico clams suggested that rays selected prey patches based on density, though there was no evidence of rays depleting clam patches to extirpation. Overall, spotted eagle rays had modest impacts on local shellfish populations at current population levels, suggesting a reduced role in transmitting cascading effects from apex predator loss. However, due to the strong degree of coupling between rays and multiple protected mollusks in HS, ecosystem-based management that accounts for ray predation should be adopted.
Keywords	Medicine ; R ; Science ; Q
Subject code	590 ; 333
Language	English
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Reopening of a Remote Tidal Inlet Increases Recruitment of Estuarine-Dependent Nekton

Hall, Quentin A / Gregory W. Stunz / Jason A. Williams / Matthew J. Ajemian / Megan M. Reese Robillard

Estuaries and coasts. 2016 Nov., v. 39, no. 6

2016

Abstract: Cedar Bayou, a natural tidal inlet, was recently dredged to allow for direct water exchange between the Gulf of Mexico and Mesquite Bay, TX, USA. We quantified changes in densities of juvenile nekton (fish, shrimps, and crabs) and community structure in ... ...

Abstract	Cedar Bayou, a natural tidal inlet, was recently dredged to allow for direct water exchange between the Gulf of Mexico and Mesquite Bay, TX, USA. We quantified changes in densities of juvenile nekton (fish, shrimps, and crabs) and community structure in Mesquite Bay after Cedar Bayou was reopened by collecting samples at both control and impact sites using an epibenthic sled 1Â year before (October 2013âApril 2014) and after (October 2014âApril 2015) opening. Significantly higher densities of total nekton were observed at the impact sites after opening using a before-after control-impact design. Red Drum (Sciaenops ocellatus), Atlantic Croaker (Micropogonias undulatus), post-larval penaeid shrimps (Farfantepenaeus aztecus, F. duorarum, and Litopenaeus setiferus), and Blue Crabs (Callinectes sapidus) were significantly more abundant at impact sites after Cedar Bayou was opened. Multivariate analysis showed a significant change in impact site communities after opening and was driven by an increased presence of estuarine-dependent species. Overall, this study demonstrates that opening tidal inlets, such as Cedar Bayou, and reconnecting Mesquite Bay to the Gulf of Mexico increased the presence of numerous estuarine-dependent species, many of which were not present or occurred at very low densities prior to reopening. Thus, reestablishing the historical connectivity between a productive estuary and the open Gulf of Mexico via Cedar Bayou should reinstitute natural nekton recruitment processes important to the Aransas, Mesquite, and San Antonio Bay regions.
Keywords	Callinectes sapidus ; community structure ; crabs ; estuaries ; Farfantepenaeus aztecus ; fish ; juveniles ; Litopenaeus setiferus ; Micropogonias undulatus ; multivariate analysis ; nekton ; postlarvae ; Sciaenops ocellatus ; shrimp ; Gulf of Mexico ; Texas
Language	English
Dates of publication	2016-11
Size	p. 1769-1784.
Publishing place	Springer US
Document type	Article
ZDB-ID	2229170-2
ISSN	1559-2731 ; 1559-2723
ISSN (online)	1559-2731
ISSN	1559-2723
DOI	10.1007/s12237-016-0111-3
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: First insights into the movements of young-of-the-year white sharks (Carcharodon carcharias) in the western North Atlantic Ocean

Tobey H. Curtis / Gregory Metzger / Christopher Fischer / Brett McBride / Michael McCallister / Leann J. Winn / Jessica Quinlan / Matthew J. Ajemian

Scientific Reports, Vol 8, Iss 1, Pp 1-

2018 Volume 8

Abstract: Abstract In recent years, white sharks (Carcharodon carcharias) have become more accessible to researchers off the northeastern U.S. as feeding aggregation sites have emerged and the population has increased. However, there has been limited research on ... ...

Abstract	Abstract In recent years, white sharks (Carcharodon carcharias) have become more accessible to researchers off the northeastern U.S. as feeding aggregation sites have emerged and the population has increased. However, there has been limited research on young-of-the-year (YOY) sharks relative to older age classes in this region. Previous research indicated that YOY white sharks were most frequently observed in the New York Bight, suggesting the region serves a nursery role. To further examine the species’ use of this area, we deployed satellite and acoustic tags on ten YOY white sharks (138–166 cm total length) off Long Island, New York. The sharks remained resident in New York Bight waters through summer (August through October), further supporting the notion that the region is a nursery area. Southward movements were observed during fall, with overwintering habitat identified off North and South Carolina shelf waters. Return migrations toward the New York Bight were observed in some individuals the following spring. YOY white sharks in this heavily-populated region are exposed to anthropogenic impacts such as fisheries bycatch and coastal habitat degradation. As juvenile survival rates are important for long-term population sustainability, further research is necessary to assess the potential impacts of these activities on the western North Atlantic white shark population.
Keywords	Medicine ; R ; Science ; Q
Subject code	910
Language	English
Publishing date	2018-07-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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