scholarly journals Traps and netting, better together than alone: an innovative approach to improve Procambarus clarkii management

2020 ◽  
pp. 39
Author(s):  
Juan García-de-Lomas ◽  
Elías D. Dana ◽  
Rubén González
Keyword(s):  
Procambarus Clarkii ◽  
Size Structure ◽  
Effective Control ◽  
Total Catch ◽  
Complementary Method ◽  
Fine Mesh ◽  
Combined Use ◽  
Invasive Crayfish ◽  
Negative Impacts ◽  
Permanent Stream

The red swamp crayfish Procambarus clarkii is the most widespread invasive crayfish in Europe, and responsible for a plethora of negative impacts on aquatic ecosystems. Most capture methods used for controlling crayfish populations have a bias towards the capture of adults, however, the removal of the young-of-the-year crayfish (YOY) may be essential for achieving effective control of invasive populations. This paper analysed the crayfish caught during a management campaign carried out in five permanent stream pools from southern Spain. We compared size structure, CPUE and sex-ratio obtained with two control methods: cylindrical traps (a method commonly used in crayfish management) and horizontal hauls using a fine-mesh net (inspired by zooplankton sampling techniques). Horizontal hauls showed a higher selectivity for catching YOY and higher efficiency (eight-fold) than traps. The combined use of both gears increased total catch by 46%. Our results suggest that YOY may be sharply underestimated if only cylindrical traps are used. The YOY cohort represented 60% of the total catch during the management campaign. Therefore, active netting with a fine mesh may be a complementary method to the use of traps in order to manage invasive populations of P. clarkii and may provide a better understanding of the structure and dynamics of invasive crayfish populations.

scholarly journals Can heat waves change the trophic role of the world’s most invasive crayfish? Diet shifts in Procambarus clarkii

PLoS ONE ◽  
2017 ◽  
Vol 12 (9) ◽  
pp. e0183108 ◽  
Author(s):  
Bruno M. Carreira ◽  
Pedro Segurado ◽  
Anssi Laurila ◽  
Rui Rebelo
Keyword(s):  
Procambarus Clarkii ◽  
Heat Waves ◽  
Invasive Crayfish ◽  
Diet Shifts ◽  
Trophic Role

Combined use of a synthetic trail pheromone and insecticidal bait provides effective control of an invasive ant

2011 ◽  
Vol 67 (10) ◽  
pp. 1230-1236 ◽  
Author(s):  
Eiriki Sunamura ◽  
Shun Suzuki ◽  
Koji Nishisue ◽  
Hironori Sakamoto ◽  
Megumi Otsuka ◽  
...  
Keyword(s):  
Trail Pheromone ◽  
Effective Control ◽  
Invasive Ant ◽  
Combined Use

scholarly journals Using a double codend to reduce discard mortality

2009 ◽  
Vol 66 (10) ◽  
pp. 2077-2081 ◽  
Author(s):  
Matt K. Broadhurst ◽  
Russell B. Millar ◽  
Sebastian S. Uhlmann
Keyword(s):  
Cloud Cover ◽  
Marine Science ◽  
Total Catch ◽  
Fishing Mortality ◽  
Short Term ◽  
Discard Mortality ◽  
Conventional Design ◽  
Gear Selectivity ◽  
Negative Impacts

Abstract Broadhurst, M. K., Millar, R. B., and Uhlmann, S. S. 2009. Using a double codend to reduce discard mortality. – ICES Journal of Marine Science, 66: 2077–2081. Traditional technical strategies for mitigating collateral fishing mortality have involved improving gear selectivity (to reduce bycatch) and, more recently, concomitant changes to onboard handling procedures to reduce some of the negative impacts to the remaining discards. A less common approach is to modify gears physically to minimize deleterious catching mechanisms and subsequent mortalities during fishing. This study aimed to investigate the utility of the latter category of modifications for penaeid trawls by separating a codend into two compartments (termed a double codend) to alleviate interactions between catches. Compared with a conventional design, the double codend significantly reduced the immediate (from 17.1 to 13.8%) and short-term (22.5 to 17.1%) mortalities of discarded juvenile school prawns (Metapenaeus macleayi). The effectiveness of the double codend remained independent of other factors known to affect the fate of discarded juvenile M. macleayi, including cloud cover and, owing to minimal variability, the weight of the total catch. However, irrespective of the codend configuration, overall mortalities were also positively correlated with the quantity of jellyfish. We conclude that when combined with modifications to improve selectivity and appropriate onboard handling strategies, compartmentalizing codend catches could cumulatively reduce unaccounted fishing mortality.

scholarly journals Presence of Paragonimus species within secondary crustacean hosts in Bogotá, Colombia

2019 ◽  
Vol 32 (2) ◽  
pp. 150-157
Author(s):  
Gillian Phillips ◽  
David M Hudson ◽  
Jenny J Chaparro-Gutiérrez
Keyword(s):  
El Niño ◽  
Total Population ◽  
Procambarus Clarkii ◽  
El Nino ◽  
Southern Oscillation ◽  
Human Populations ◽  
Infection Prevalence ◽  
Invasive Crayfish ◽  
The Difference ◽  
Trematode Parasites

Background: Paragonimus spp. are trematode parasites that infect human populations worldwide. It is believed that infection rates within Asia reach five to ten percent of the total population. Three of the largest areas of possible infection are Asia, Central and South America as well as Africa, where the total population at risk is estimated to be 293 million people. Humans are infected via ingestion of raw or undercooked decapod crustaceans. Objective: To identify the presence of Paragonimus spp. in crabs from Bogotá, Colombia. Methods: The native crab Neostrengeria macropa and the aquatic invasive crayfish Procambarus clarkii in Bogotá, Colombia, were collected from local markets, pet stores and waterways and dissected to assess the presence of Paragonimus spp.  Results: The native crab species, N. macropa (n=29) had an infection prevalence of 17.2%, while the invasive crayfish species, P. clarkii (n=22), had a prevalence of 36.4% combined from both field captured animals and purchased samples. Conclusion: Although the estimated prevalence is lower compared to previous studies in other cities of Colombia, Paragonimus represent a risk to human health. Several environmental factors may contribute to the difference in prevalence including collecting season, rainfall, temperature, altitude and the El Niño Southern Oscillation. Keywords: crabs, invasive species, Neostrengeria macropa, Procambarus clarkii, trematode. ResumenAntecedentes: Los Paragonimus spp. constituyen un grupo de parásitos tremátodos que infectan a humanos en todo el mundo. Se considera que entre 5 y 10% de la población humana de Asia está infectada. Las áreas con mayor posibilidad de infección son Asia, Centro y Sur América, así como África. Se estima que 293 millones de personas están en riesgo de infección. Los humanos se pueden infectar al consumir crustáceos decápodos crudos. Objetivo: Identificar la presencia de Paragonimus spp. en crustáceos en Bogotá, Colombia. Métodos: Una muestra de cangrejos nativos Neostrengeria macropa y de decápodos invasores Procambarus clarkii fue colectada tanto en mercados locales de Bogotá, como en tiendas de mascotas, ríos, y quebradas. Posteriromente fueron diseccionados para detectar la presencia de Paragonimus spp. Resultados: La prevalencia de la infección en N. macropa (n=29) fue de 17,2%, y en la especie invasora, P. clarkii (n=22), fue de 36,4% (porcentaje combinado de los animales colectados en el campo y los comprados en tiendas). Conclusión: Aunque la prevalencia en este estudio fue más baja que la de otras investigaciones relacionadas, se considera que existe riesgo para la salud humana. Es probable que algunos factores medio ambientales hayan contribuido a la diferencia, incluyendo: temporada de colecta, nivel de lluvias, temperatura, altura, y el fenómeno El Niño. Palabras claves: cangrejos, especie invasora, Neostrengeria macropa, Procambarus clarkii, tremátodo. ResumoAntecedentes: Paragonimus spp. são trematódeos parasitas que infectam populações humanas ao redor do mundo. Acredita-se que as taxas de infecção na Ásia atingem de 5 a 10% da população. As três maiores áreas de infecção se localizam na Ásia, Américas do Sul e Central e África, onde a população total em risco é estimada em 293 milhões de pessoas. Os humanos são infectados pela ingestão de crustáceos decápodes crus ou mal cozidos. Objetivo: Identificar a presença de Paragonimus spp. em Bogotá, Colômbia. Métodos: Indivíduos de caranguejo nativo Neostrengeria macropa e lagostim aquático invasivo Procambarus clarkii  foram coletados em mercados locais, lojas de animais de estimação e cursos de água em Bogotá (Colômbia) e posteriormente dissecados para verificação da presença de Paragonimus spp. Resultados: A espécie de caranguejo nativa N. macropa (n=29) apresentou prevalência de infecção de 17,2%, enquanto a espécie de lagostim invasivo, P. clarkii (n=22), apresentou prevalência de 36,4%, quando combinados os animais capturados em campo e os animais comprados. Conclusão: Embora a prevalência estimada neste estudo foi menor do que a de pesquisas anteriores realizadas em outras cidades da Colômbia, existe um risco para a saúde humana. Há inúmeros fatores ambientais que podem contribuir para a diferença de prevalência, dentre eles: a estação em que a coleta foi realizada, pouca precipitação, temperatura, altitude e a Oscilação Sul-El Niño.Palabras-chave: caranguejos, espécies invasivas, Neostrengeria macropa, Procambarus clarkii, trematódeos.

Environmental factors influencing the distribution and abundance of the introduced signal crayfish in the north of Iberian Peninsula

2017 ◽  
Vol 68 (5) ◽  
pp. 900 ◽  
Author(s):  
I. Vedia ◽  
D. Galicia ◽  
E. Baquero ◽  
J. Oscoz ◽  
R. Miranda
Keyword(s):  
Aquatic Ecosystems ◽  
Procambarus Clarkii ◽  
Lower Proportion ◽  
Native Fish ◽  
Limiting Factor ◽  
Northern Spain ◽  
Signal Crayfish ◽  
The North ◽  
Organic Debris ◽  
Invasive Crayfish

The identification of habitat requirements of invasive species is essential to evaluate their spread and to assess the vulnerability of recipient ecosystems. We studied the distribution and abundance of the invasive signal crayfish (Pacifastacus leniusculus) in 43 sites in northern Spain and analysed the relationships with several abiotic and biotic parameters of the aquatic ecosystems. Our results indicated that the abundance of signal crayfish was positively associated with vegetation cover and negatively associated with boulders. Also, its abundance was positively correlated with water temperature, organic matter, cations (e.g. sodium), anions (e.g. sulfates) and abundance of some native fish species (Parachondrostoma miegii and Luciobarbus graellsii). We concluded that the habitat of signal crayfish is among salmonid stretches (headwaters) with cold waters and low proportion of organic debris, and among cyprinid stretches (low waters) with warmer waters which it inhabits with another invasive crayfish, the red swamp crayfish (Procambarus clarkii). Our analysis indicated that the presence of signal crayfish is limited in the uppermost stretches by lower water temperatures and a lower proportion of organic debris. The existence of a natural environmental limiting factor in upstream reaches facilitates the conservation of aquatic ecosystems and native fauna.

Mycoflora on the cuticle of the invasive crayfish Procambarus clarkii

2012 ◽  
Vol 180 (1) ◽  
pp. 77-84 ◽  
Author(s):  
Ambrosius Josef Martin Dörr ◽  
Marinella Rodolfi ◽  
Antonia Concetta Elia ◽  
Massimiliano Scalici ◽  
Laura Garzoli ◽  
...  
Keyword(s):  
Procambarus Clarkii ◽  
Invasive Crayfish
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