scholarly journals A Comparison of Traditional and Locally Novel Fishing Gear for the Exploitation of the Invasive Atlantic Blue Crab in the Eastern Adriatic Sea

2021 ◽  
Vol 9 (9) ◽  
pp. 1019
Author(s):  
Luka Glamuzina ◽  
Alexis Conides ◽  
Giorgio Mancinelli ◽  
Branko Glamuzina
Keyword(s):  
Blue Crab ◽  
Significant Contribution ◽  
Adriatic Sea ◽  
Gravid Female ◽  
Fishing Gear ◽  
Blue Crabs ◽  
Catch Per Unit Effort ◽  
Management Tools ◽  
The Mediterranean ◽  
Fyke Nets

The Atlantic Blue Crab Callinectes sapidus has been recognized as invasive in the Mediterranean Sea, where it now provides a significant contribution to artisanal fisheries. In this study, we compared the efficiency, selectivity, and productivity of American wire crab traps and traditional fyke nets for the capture of Blue Crabs in a study conducted from June to December 2019 in the Parila Lagoon (River Neretva Estuary, Croatia). A total of 7707 specimens were caught in 15 wire traps, comprising 6959 males and 749 females. The total catch using 50 traditional fyke traps was 1451 crabs, of which 1211 were males and 240 were females. In general, wire crab traps showed a higher capture selectivity and economic performance compared to fyke nets. The catch per unit effort (CPUE) was 102.76 kg for the American wire crab trap and 5.96 kg for the traditional fyke net. The CPUE of gravid female Blue Crabs was lower for the wire traps than the fyke nets. Herein, the utility of crab traps as selective fishing gear for the capture of Blue Crabs, and management tools for control of the reproductive and recruitment phases of the crab, are discussed, with the perspective of future exploitation of the species as a commercially valuable shellfish product in the Mediterranean.

scholarly journals Coastal Vegetation and Bathymetry Influence Blue Crab Abundance Across Spatial Scales

2022 ◽  
Author(s):  
Selina L. Cheng ◽  
Kinsey N. Tedford ◽  
Rachel S. Smith ◽  
Sean Hardison ◽  
Michael R. Cornish ◽  
...  
Keyword(s):  
Blue Crab ◽  
Salt Marshes ◽  
Spatial Scales ◽  
Gravid Female ◽  
Habitat Associations ◽  
Habitat Characteristics ◽  
Coastal Vegetation ◽  
Blue Crabs ◽  
Catch Per Unit Effort ◽  
Western Atlantic

AbstractBlue crabs (Callinectes sapidus) are highly mobile, ecologically-important mesopredators that support multimillion-dollar fisheries along the western Atlantic Ocean. Understanding how blue crabs respond to coastal landscape change is integral to conservation and management, but such insights have been limited to a narrow range of habitats and spatial scales. We examined how local-scale to landscape-scale habitat characteristics and bathymetric features (channels and oceanic inlets) affect the relative abundance (catch per unit effort, CPUE) of adult blue crabs across a > 33 km2 seagrass landscape in coastal Virginia, USA. We found that crab CPUE was 1.7 × higher in sparse (versus dense) seagrass, 2.4 × higher at sites farther from (versus nearer to) salt marshes, and unaffected by proximity to oyster reefs. The probability that a trapped crab was female was 5.1 × higher in sparse seagrass and 8 × higher near deep channels. The probability of a female crab being gravid was 2.8 × higher near seagrass meadow edges and 3.3 × higher near deep channels. Moreover, the likelihood of a gravid female having mature eggs was 16 × greater in sparse seagrass and 32 × greater near oceanic inlets. Overall, we discovered that adult blue crab CPUE is influenced by seagrass, salt marsh, and bathymetric features on scales from meters to kilometers, and that habitat associations depend on sex and reproductive stage. Hence, accelerating changes to coastal geomorphology and vegetation will likely alter the abundance and distribution of adult blue crabs, challenging marine spatial planning and ecosystem-based fisheries management.

scholarly journals The return of the Blue Crab, Callinectes sapidus Rathbun, 1896, after 70 years from its first appearance in the Gulf of Trieste, northern Adriatic Sea, Italy (Decapoda: Portunidae)

Check List ◽  
2016 ◽  
Vol 12 (6) ◽  
pp. 2006 ◽  
Author(s):  
Chiara Manfrin ◽  
Giovanni Comisso ◽  
Andrea Dall’Asta ◽  
Nicola Bettoso ◽  
J. Sook Chung
Keyword(s):  
Blue Crab ◽  
Adriatic Sea ◽  
Callinectes Sapidus ◽  
First Record ◽  
Blue Crabs ◽  
Northern Adriatic Sea ◽  
Northern Adriatic ◽  
Gulf Of Trieste

Since August 2015, an increasing number of Blue Crabs, Callinectes sapidus Rathbun, 1896, have been reported in the Marano and Grado Lagoon, Gulf of Trieste, in the northern Adriatic Sea. This species is not a new introduction and in fact the first record of C. sapidus in Italy and the entire Adriatic Sea dates back to 1949 in the Grado Lagoon. Interestingly, no other records of C. sapidus have been reported since the first record. Here, we note the re-appearance of C. sapidus in the Gulf of Trieste.

scholarly journals Morphometric measurements of newborn blue shark Prionace glauca (Linnaeus, 1758) and characteristics of its potential parturition areas in coastal waters of Montenegro (Southeastern Adriatic)

2019 ◽  
Vol 60 (1) ◽  
pp. 61-67
Author(s):  
Ilija Ćetković ◽  
Ana Pešić ◽  
Aleksandar Joksimović ◽  
Jovana Tomanić ◽  
Stefan Ralević
Keyword(s):  
Coastal Waters ◽  
Adriatic Sea ◽  
Gravid Female ◽  
Fishing Gear ◽  
Shark Species ◽  
Morphometric Measurements ◽  
Blue Shark ◽  
The World ◽  
Different Types ◽  
Almost All

The blue shark belongs to the group of the most widespread pelagic sharks in the world. It inha-bits the pelagic zone of almost all warm and temperate seas and oceans. As it is one of the most abundant shark species, it is frequently caught in different types of fishing gear operated in the pela-gic zone. This study provides the first data on the reproduction of this species in Montenegrin waters (in the Southeastern Adriatic Sea). Six newborn blue sharks were found during our field excursions. For three of them, detailed morphometric measurements are presented. Alongside the newborns, a gravid female was also recorded. The data was collected in the period from April to October 2017. According to the published literature and the data presented in this paper, species reproduction is likely to be seasonal. A review of the areas where the specimens were recorded was carried out in order to infer if the adult females choose them specifically as their parturition grounds

scholarly journals Observations on the Feeding of Drymonema dalmatinum in the Gulf of Trieste

Diversity ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 163
Author(s):  
Saul Ciriaco ◽  
Lisa Faresi ◽  
Marco Segarich
Keyword(s):  
Mediterranean Sea ◽  
Adriatic Sea ◽  
Gulf Of Trieste ◽  
The Mediterranean ◽  
Scyphozoan Jellyfish

The largest scyphozoan jellyfish of the Mediterranean Sea, Drymonema dalmatinum was first described by Haeckel [1] from material collected off the Dalmatian coast of the Adriatic Sea [...]

Predation by southern sea lions (Otaria flavescens) on artisanal fishing catches in Uruguay

2002 ◽  
Vol 53 (8) ◽  
pp. 1161 ◽  
Author(s):  
Diana Szteren ◽  
Enrique Páez
Keyword(s):  
Significant Relationship ◽  
Shallow Waters ◽  
Fishing Gear ◽  
Artisanal Fishery ◽  
Artisanal Fishing ◽  
Catch Per Unit Effort ◽  
Sea Lion ◽  
Otaria Flavescens ◽  
Sea Lions ◽  
Unit Effort

Southern sea lions (Otaria flavescens) forage in coastal fishery grounds in shallow waters, where they interact with coastal fishing activities. The main objective of this research was to evaluate the predation of southern sea lions on artisanal fishery catches and thus determine whether interactions with sea lions affected catches. Between July 1997 and March 1998, we observed 53 fishing events onboard artisanal fishing boats in four localities. The presence and number of sea lions around the boat and the numbers of each fish species consumed by sea lions were recorded by an onboard observer. To estimate the damage caused by sea lions to fishery catches, we considered two scenarios, a conservative scenario and a maximized scenario. Predation on catches was observed in 50.9% of all the fishing events and up to four sea lions were sighted in 67.9% of fishing events. Considering a conservative scenario, predation varied from 0.8 to 9.1% of the catch per unit effort (CPUE) depending on the location. Considering the maximized scenario, predation varied from 3.4 to 46.2%. However, no significant relationship was found between CPUE and the number of sea lions in any locality or with either type of fishing gear. Furthermore, CPUE did not differ in the presence or absence of sea lion interactions and predation per unit effort did not vary between localities or seasons. It was concluded that neither the presence of sea lions nor the damage they cause were responsible for variations in CPUE.

scholarly journals First record of the Combtooth Blenny, Microlipophrys adriaticus (Steindachner & Kolombatovic, 1883) (Pisces, Blenniidae), for the Italian Ionian Sea

Check List ◽  
2015 ◽  
Vol 11 (3) ◽  
pp. 1646 ◽  
Author(s):  
F. Tiralongo ◽  
R. Baldacconi
Keyword(s):  
Mediterranean Sea ◽  
Black Sea ◽  
Adriatic Sea ◽  
First Record ◽  
The Black Sea ◽  
Ionian Sea ◽  
Sea Of Marmara ◽  
Limited Distribution ◽  
The North ◽  
The Mediterranean

Microlipophrys adriaticus (Steindachner & Kolombatovic, 1883) is an endemic blenny of the Mediterranean Sea. It is also known from the Sea of Marmara and the Black Sea. However, unlike other species of combtooth blennies, M. adriaticus is a fish with a limited distribution in Adriatic Sea, especially in the north, where it can be common. We report here the first record of this species from the waters of the Ionian Sea.

Abundance and population structure of the blue crab Callinectes sapidus (Decapoda, Portunidae) in Thermaikos Gulf (Methoni Bay), northern Aegean Sea

Crustaceana ◽  
2018 ◽  
Vol 91 (6) ◽  
pp. 641-657 ◽  
Author(s):  
Kosmas Kevrekidis ◽  
Chryssanthi Antoniadou
Keyword(s):  
Population Structure ◽  
Blue Crab ◽  
Callinectes Sapidus ◽  
Carapace Width ◽  
Seawater Temperature ◽  
Aegean Sea ◽  
Cold Season ◽  
Mean Size ◽  
Northern Aegean Sea ◽  
Fyke Nets

Abstract The blue crab Callinectes sapidus is an alien decapod established in the Mediterranean Sea. Since 2007, increased abundance has been reported from the northern Aegean Sea sustaining local scale fishery. The present work aims to assess the abundance and population structure of C. sapidus in Thermaikos Gulf using fyke nets. Population abundance, estimated as CPUE, exhibited strong temporal variability with decreased values in the cold season; this pattern was correlated with seawater temperature. Females exhibited also spatial differences with increased abundance close to the Aliakmon estuary. In total, 543 individuals were measured for carapace width. Males prevailed in the population; however, mean size was similar between sexes. Larger individuals were caught from deeper waters and the estuarine areas, whereas mean size decreased temporally. The fyke nets used proved to be size-selective, thus preventing fisheries mortality for juveniles. However, recurrent monitoring is necessary for a sustainable management of blue crab fisheries in the gulf.

scholarly journals Chemical encoding of risk perception and predator detection among estuarine invertebrates

2018 ◽  
Vol 115 (4) ◽  
pp. 662-667 ◽  
Author(s):  
Remington X. Poulin ◽  
Serge Lavoie ◽  
Katherine Siegel ◽  
David A. Gaul ◽  
Marc J. Weissburg ◽  
...  
Keyword(s):  
Risk Perception ◽  
Blue Crab ◽  
Urinary Metabolites ◽  
Ecological Interactions ◽  
Blue Crabs ◽  
Predator Detection ◽  
Prey Behavior ◽  
Wide Range ◽  
Panopeus Herbstii ◽  
Mud Crabs

An effective strategy for prey to survive in habitats rich in predators is to avoid being noticed. Thus, prey are under selection pressure to recognize predators and adjust their behavior, which can impact numerous community-wide interactions. Many animals in murky and turbulent aquatic environments rely on waterborne chemical cues. Previous research showed that the mud crab, Panopeus herbstii, recognizes the predatory blue crab, Callinectus sapidus, via a cue in blue crab urine. This cue is strongest if blue crabs recently preyed upon mud crabs. Subsequently, mud crabs suppress their foraging activity, reducing predation by blue crabs. Using NMR spectroscopy- and mass spectrometry-based metabolomics, chemical variation in urine from blue crabs fed different diets was related to prey behavior. We identified the urinary metabolites trigonelline and homarine as components of the cue that mud crabs use to detect blue crabs, with concentrations of each metabolite dependent on the blue crab’s diet. At concentrations found naturally in blue crab urine, trigonelline and homarine, alone as well as in a mixture, alerted mud crabs to the presence of blue crabs, leading to decreased foraging by mud crabs. Risk perception by waterborne cues has been widely observed by ecologists, but the molecular nature of these cues has not been previously identified. Metabolomics provides an opportunity to study waterborne cues where other approaches have historically failed, advancing our understanding of the chemical nature of a wide range of ecological interactions.

Heating Curves During Commercial Cooking of the Blue Crab

1976 ◽  
Vol 39 (4) ◽  
pp. 258-262 ◽  
Author(s):  
R. W. DICKERSON ◽  
M. R. BERRY
Keyword(s):  
Blue Crab ◽  
Clostridium Botulinum ◽  
Heating Temperature ◽  
Water Bath ◽  
Boiling Water ◽  
Boiling Water Bath ◽  
Blue Crabs ◽  
Commercial Processing

Blue crabs are cooked in steam retorts or boiling water baths to assist in removing the meat from the shell. As a first step in determining if spores of Clostridium botulinum would survive the process, internal crab temperatures were measured during cooking in commercial plants. Tests were done in six states. Crabs were instrumented with thermocouples, and heating curves were recorded during normal commercial processing. The lowest terminal heating temperature achieved in an instrumented crab during steam retorting was 208 F; however, this temperature remained above 180 F for 4 min. In the boiling water bath, the terminal heating temperature was slightly lower (205 F) but the time above 180 F was longer (11 min).

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