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La consommation des poissons d’eau douce et de l’aquaculture en Algérie, spécialement le tilapia: état des lieux et perspectives.
No full textAfin d’avoir une idée concrète sur la consommation et l’état de connaissance des produits de l’aquaculture et des espèces continentales en Algérie, une enquête a été menée en 2023 auprès de 220 personnes, représentatives de la population algérienne. L’enquête de satisfaction a été faite directement auprès des répondants et en ligne via un formulaire en utilisant Google Formes. Les répondants ont été interrogés par rapport à leurs consommations du poisson et par rapport à leurs connaissances des produis de la pêche et de l’aquaculture. Les résultats de l’enquête ont été traduits en utilisant l’outil Excel 2016. L'étude a montré que la consommation de poisson en Algérie est faible, principalement à cause du prix élevé, de la faible disponibilité du poisson d'eau douce et d'aquaculture et du manque de sensibilisation aux bienfaits du poisson et des produits d’élevage. La consommation de poisson est fortement saisonnière, avec une dominance en été due à la disponibilité et au prix plus bas du poisson. Les espèces les plus consommées sont les poissons pélagiques, comme la sardine et les anchois. Concernant le prix des poissons, 81% des répondants trouvent le prix très élevé contre 17,2% qui trouvent le prix des poissons abordable. Selon les répondants, la consommation des poissons est liée à la disponibilité sur le marché et le prix de vente. La consommation des poissons d'eau douce et de l'aquaculture est encore faible, avec la dominance du tilapia pour les poissons d’élevage d’eau douce et la daurade pour les poissons marins. Pour améliorer la situation, il faudrait réduire le prix du poisson, augmenter la production de poisson d'eau douce et d'aquaculture et sensibiliser les consommateurs aux avantages du poisson.In order to have a concrete idea of the consumption and state of knowledge of aquaculture products and continental species in Algeria, a survey was conducted with 220 people, representative of the Algerian population. The satisfaction survey was carried out directly with respondents and online via Google Forms. Respondents were questioned about their fish consumption and their knowledge of fisheries and aquaculture products. The survey results were studied using the Excel 2016 program. The study showed that fish consumption in Algeria is low, mainly due to the high price, the low availability of freshwater and aquaculture fish, and the lack of awareness of the benefits of fish. The results show that the majority of respondents consume fish, especially in summer. Regarding the price of fish, 81% of respondents find the price very high, compared to 17.2% who find the price of fish affordable. According to the respondents, fish consumption is linked to availability on the market and sales price. To improve the situation, it would be necessary to reduce the price of fish, increase the production of freshwater and aquaculture fish, and raise awareness among consumers of the benefits of fish.Références bibliographiques, Figures.PublishedReferee
Boletín CTN Diocean No. 3 / 2023
No full textHace tres años atrás el Comité Técnico Nacional de Coordinación de Datos e Información Oceánicos (CTN Diocean) de la Comisión Colombiana del Océano (CCO), estableció un plan de trabajo que abarca cinco años de actividades institucionales para fortalecer la gestión de estos importantes activos del país. Para entonces se tuvieron en cuenta diferentes estrategias como línea base para definir las tareas a desarrollar, y en la actualidad es gratificante para miembros e invitados permanentes confirmar, que lo planeado sigue vigente y acorde con los desafíos del ‘Decenio de las Ciencias Oceánicas para el Desarrollo Sostenible’, las necesidades de la comunidad y los recientes lineamientos de política nacionales e internacionales. En el presente número del Boletín CTN Diocean, se destacan entre otros, dos reconocimientos logrados en el nivel internacional por parte de instituciones que hacen parte del comité y que le aportan al fortalecimiento de la gestión de datos oceánicos de Colombia: el primero, los datos abiertos oceanográficos como una actividad del ‘Decenio de las Ciencias Oceánicas para el Desarrollo Sostenible’ de la Comisión Oceanográfica Intergubernamental (COI); y el segundo, la copresidencia para el periodo entre sesiones 2023-2025 del programa para el Intercambio Internacional de Datos Oceanográficos (COI-IODE) junto con Suecia, en el marco de la cual se inició la asesoría con nuestros hermanos panameños en la materia.PublishedNot Know
Economic analysis of the fisheries and aquaculture sector in Algeria, and growth prospects in the context of the blue economy.
No full textThe fisheries and aquaculture sector in Algeria has attracted significant attention since 2018, and these encouraging indicators were further confirmed by developments of what in 2022. The remarkable growth experienced can be attributed to several key factors that have contributed to the substantial increase in aquaculture production. This growth has been supported by a sectoral policy focused on promoting aquaculture, facilitating technology transfer, and implementing incentive measures. Moreover, the redirection of capital towards this sector, particularly after the recession in the public works sector, has accelerated growth and development. The data underscores this robust growth, with the sector generating 115,672 direct jobs and witnessing an impressive overall production increase of 11.13%, primarily driven by a substantial 21.43% rise in aquaculture. Export volumes surged by an exceptional 149.5%, accompanied by a 68.07% increase in value, while imports saw a decline of -23.43%. Turnover also saw a significant increase of 15.57%. By 2022, the sector had gained strategic recognition constituting 5% of the entire agricultural sector, contributing 0.2% to GDP, and supporting over 145,000 jobs. The investment landscape has also played a crucial role, with approximately 10 billion DA invested in aquaculture alone, leading to remarkable growth of 67%. Aquaculture, currently representing 10% of the sector's total production, doubled within two years, demonstrating double-digit growth and aiming to achieve 33% by 2035 and 50% by 2050 through substantial investment. Despite these impressive numbers, challenges such as limited fish stocks necessitate stringent measures to ensure the sustainability of the fishery. Nevertheless, these advancements present significant opportunities for the sustainable development of the sector, showcasing promising prospects for further growth, job creation, and economic contribution. Moreover, the success of Algeria's fisheries and aquaculture sector aligns with the principles of the blue economy, emphasizing sustainable use and conservation of marine resources. The development of this sector within the blue economy framework is crucial for ensuring long-term environmental and economic viability, fostering innovation, and promoting responsible practices. This approach not only contributes to economic growth but also supports environmental conservation, making it imperative for the sector's continued success and contribution to a sustainable and prosperous future.Références bibliographiques, Figures, Tableaux.PublishedReferee
nano shinbun ナ ノ 新 聞
No full textContent: 1) From the Editorial Board; 2) Meet the new members; 2.1) NF-POGO Cenrte of Excellence in Observational Oceanography 2023-2024; 2.2) NF-POGO Visiting Fellowship for Shipboard Training; 3) NANO-DOAP Research Project; 4) NANO members in Action; 5) Career insights survey; 6) Alumni in the field; 7) Scientific event announcementsPublishedReferee
Effect of the green macroalgae Chaetomorpha linum liquid extract on the germination, growth and pigments concentration of the chickpea Cicer arietinum L., 1753.
No full textFertilizer production and application are growing excessively with increased agricultural expenses and environmental damage. As alternatives, organic fertilizers issued from natural resources such as seaweed liquid extracts (SLE) are considered as potential plant biostimulant agents. In this study, the impact of the green algae Chaetomorpha linum SLE on seed germination, yield and pigmenting characteristics of the chickpea Cicer arietinum was investigated in laboratory settings and in pots. Several SLE concentrations varying from 1%, 3%, 5%, 8% to 10% were prepared using distilled water. The application of SLE significantly affected all assessed parameters over the control (0%). Use of SLE at the lowest concentration (1%) showed maximum seed germination, root and shoot length and contents of total chlorophyll, chl (a), and chl (b). Accordingly, the results suggest that C. linum SLE could be used as an alternative organic fertilizer because it is environmentally friendly and profitable. This extract, rich in plants growth components, could find its future use in various sectors.PublishedReferee
Population characteristics of Diadema antillarum (Philippi, 1845) (Echinoidea: Diadematidae) in reef crests of the northwestern region of Cuba.
No full textDiadema antillarum es considerada como el principal invertebrado herbívoro de los arre- cifes de coral del Caribe. Debido a la significación que representa esta especie, en esta investigación se evaluaron indicadores poblacionales de la misma en las crestas arrecifales de playa Baracoa y Rincón de Guanabo, costa noroccidental de Cuba. Los muestreos se realizaron en enero-marzo de 2021. Se estimó la densidad media, diámetro medio de la testa, porcentaje de juveniles y adultos, de agregaciones y albinismo de D. antillarum para cada cresta. Las variables fueron evaluadas utilizando un transecto de banda de 10 m de largo por 1 m de ancho. La densidad media de D. antillarum en playa Baracoa (19.28 ± 14.40 ind./10 m2) fue superior al valor reportado en Rincón de Guanabo (0.78 ± 0.43 ind./10 m2) y en algunos arrecifes del Caribe. En playa Baracoa el porcentaje de indivi- duos adultos representa el 95.25 % del total. El diámetro medio de D. antillarum en playa Baracoa (5.53 ± 1.76 cm) y Rincón de Guanabo (3.05 ± 1.56 cm) resultó ser inferior al reportado en algunos arrecifes del Caribe. En playa Baracoa se encontraron 148 agrega- ciones y 40 individuos albinos. El número bajo de individuos en el Rincón de Guanabo (47) ha generado varias hipótesis que necesitaran ser corroboradas en el futuro. No se en- contró evidencia de la pandemia que sufre D. antillarum en el Caribe, lo cual se considera un indicador positivo. Se recomienda evaluar el manejo (restauración) de la especie en la cresta del Rincón de Guanabo.Diadema antillarum is considered the main herbivorous invertebrate of Caribbean co- ral reefs. Due to the significance of this specie for coral reefs, our research focused on evaluating ecological indicators of D. antillarum in the reef crests of Baracoa beach and Rincón de Guanabo on the northwestern coast of Cuba. The study was conducted between January and March of 2021. We assessed the mean density, test mean diameter, percentage of juveniles and adults, aggregations, and instances of albinism in D. anti- llarum for each crest. These variables were measured using a 10-m-long and 1-m-wide belt transect. The mean density of D. antillarum in Baracoa beach (19.28 ± 14.40 ind./10 m2) was higher than that in Rincón de Guanabo (0.78 ± 0.43 ind./10 m2) and other Caribbean reefs. In Baracoa beach, adults accounted 95.25 % of the total individuals found in this crest. The mean diameter of D. antillarum in Baracoa beach (5.53 ± 1.76 cm) and Rincón de Guanabo (3.05 ± 1.56 cm) was lower than that observed in other Caribbean reefs. In Baracoa beach, we identified 148 aggregations and 40 individuals with albinism. The low number (47) of D. antillarum individuals in Rincón de Guanabo generates new hypothesis that have to be tested in the future. No evi- dence of the pandemic affecting D. antillarum in the Ca- ribbean was found, which is considered a positive indicator. It is recommended to evaluate management (restoration) for the species in the Rincón de Guanabo crest.PublishedReferee
The effects of anthropic actions in the biotic interactions between fishes from a Neotropical floodplain: changes in species cooccurrence patterns.
No full textThe freshwater ichthyofauna is largely threatened by the anthropogenic impacts in these ecosystems. The climatic changes caused by human actions and dams’ constructions concerningly affects the freshwater fishes, including its biotic interactions network. Thus, this work aimed at evaluating the Upper Paraná River floodplain’s (UPRF) ichthyofauna under the impacts caused by climate changes, years of extreme drought an extreme flood, and under the impacts caused by the construction of an upstream dam, the Sérgio Motta Hydroelectric Power Plant, Brazil. The sampled years were classified in extreme drought, neutral and extreme flood, according to the predominant characteristics of its hydrological regime, and in pré-damming years, before the upstream hydroelectric power plant construction and reservoir’s flooding, and post-damming years. The abiotic and hydrometric variables were concurrently sampled with the abundance of fish species, allowing to exclude the environmental variables’ effects over the species’ cooccurrence, using multivariate generalized linear models with latent variables. The force of the interspecific biotic interactions was obtained through cooccurrence values for each pair of species, visualized through negative, neutral, and positive values. Regarding the results involving the hydrological regime influence, it was observed differences between drought, neutral and flood years, with stronger cooccurrence values between the UPRF’s ichthyofauna in drought years (for positive and negative values). Regarding the results involving the construction of the UPRF’s upstream dam, it was observed differences comparing the pré-damming and post-damming years cooccurrence patters, with predominantly positive values in post-damming years, and predominantly neutral cooccurrences in pré-damming years. These work results indicate the increment of the cooccurrence values between a floodplain’s fish species due to extreme droughts and upstream dams’ constructions, once the cooccurrence values were more intense under these conditions. Stands out the importance of biotic interactions for the elaboration of management plans and freshwater species conservation in response to anthropogenic actions.A ictiofauna de ambientes de água doce se encontra amplamente ameaçada por ações antrópicas. As mudanças climáticas e a construção de barragens afetam os peixes de água doce e suas redes de interações bióticas. Neste contexto, este estudo avaliou a ictiofauna da planície de inundação do alto rio Paraná (PIARP) sob os impactos de mudanças climáticas, épocas de secas e cheias extremas, e sob os impactos causados pela construção de uma barragem a montante, a Usina Hidrelétrica Sérgio Motta, Brasil. Os anos amostrados foram classificados em anos de seca extrema, neutros e de cheia extrema, de acordo com as condições predominantes de seu regime hidrológico, e em anos de pré-barramento, antes da construção e inundação do reservatório da usina hidrelétrica a montante, e pós-barramento. As variáveis abióticas e variáveis hidrométricas foram amostradas concomitantemente com a abundância das espécies de peixe, permitindo excluir o efeito das variáveis ambientais sobre a ocorrência das espécies, com o uso de modelos lineares generalizados multivariados de variáveis latentes. Obteve-se a força das interações bióticas interespecíficas pelos valores de coocorrência, positivos ou negativos, entre cada par de espécies. Com relação aos resultados envolvendo a influência dos regimes hidrológicos, foram encontradas diferenças nos valores médios de coocorrência entre anos de seca extrema, anos neutros e anos de cheia extrema, indicando que os valores de coocorrência são mais fortes entre a ictiofauna da PIARP (tanto interações positivas quanto negativas) em anos de seca. Para os efeitos da construção da barragem a montante da PIARP, observou-se diferenças entre os padrões de coocorrência de espécies antes e após a sua construção, indicando valores de coocorrência predominantemente positivos no período pós-barramento, e coocorrências predominantemente neutras no período pré-barramento. Os resultados indicam incremento nos padrões de coocorrência entre as espécies de peixes da planície de inundação frente secas extremas e construção de barragens a montante, uma vez que os valores de coocorrência foram mais intensos sob essas condições. Destaca-se a importância das interações bióticas em resposta às ações antrópicas para a elaboração de planos de manejo e para a conservação das espécies de peixes de água doce.Ph
Identificação molecular e interação parasito-hospedeiro de híbridos do gênero Piaractus no alto rio Paraná.
No full textHybridization is the interspecific crossing of species with the potential to optimize zootechnical indices, and this is a common practice in fish farming. However, inadequate management and facilities lead to escapes and fish settling in natural environments, with the possibility of impacts on local biocenoses. Little is known about genetic damage and parasite-host interactions in the case of hybrid escapes. The aims of this thesis are: i) to identify the fish morphologically collected as pacu (P. mesopotamicus) in the upper Paraná River using molecular markers such as: mitochondrial COI (cytochrome C oxidase, subunit I) and nuclear TROP (α-tropomyosin); ii) to evaluate parasite-host interactions for hybrids and their parents that coexist in the same environment, using network analysis through the metrics of modularity and nesting and then recalculating these metrics after the removal of pure and native individuals (P. mesopotamicus). The fish were identified as P. mesopotamicus, P. brachypomus, first generation hybrids (F1) with mitochondrial DNA (mtDNA) from P. brachypomus and nuclear DNA (nDNA) from P. mesopotamicus and P. brachypomus and advanced hybrids with mtDNA from P. brachypomus and nDNA from P. mesopotamicus. Regarding parasite-host interactions, the network metrics showed a tendency towards a decrease in modularity and nestedness for general and ectoparasite networks and an increase for endoparasites, after the removal of P. mesopotamicus, showing that native individuals have interactions that alter network metrics. Regarding cascade extinctions, there were no differences between hosts. This study reinforces the importance of research into hybrids in natural environments and raises concerns about genetic contamination, vulnerability to infection/infestation by parasites, and the local decline of native species, which are important for fishing and subsistence.A hibridização consiste no cruzamento interespecífico de espécies com potencial de otimização dos índices zootécnicos, sendo essa prática corriqueira na piscicultura. No entanto, o manejo e as instalações inadequadas fazem com que ocorram escapes e os peixes se instalam em ambientes naturais, com possibilidade de impactos sobre as biocenoses locais. Pouco se sabe sobre os danos genéticos e as interações parasito-hospedeiro em caso de escapes de híbridos. Os objetivos desta tese são: i) identificar os peixes morfologicamente coletados como pacu (P. mesopotamicus) no alto rio Paraná utilizando marcadores moleculares tais como: mitocondrial COI (citocromo C oxidase, subunidade I) e nuclear TROP (α-tropomiosina); ii) avaliar as interações parasito-hospedeiro para híbridos e seus parentais que coexistem no mesmo ambiente, utilizando análise de rede por meio das métricas de modularidade e aninhamento e posteriormente recalculando essas métricas após a remoção dos indivíduos puros e nativos (P. mesopotamicus). Os peixes foram identificados como P. mesopotamicus, P. brachypomus, híbridos de primeira geração (F1) com DNA mitocondrial (mtDNA) de P. brachypomus e DNA nuclear (nDNA) de P. mesopotamicus e P. brachypomus e híbrido avançado com mtDNA de P. brachypomus e nDNA de P. mesopotamicus. A maioria dos indivíduos coletados eram híbridos, somando mais de 75% da amostragem. Sobre as interações parasito-hospedeiro, as métricas de rede mostraram tendência a diminuição da modularidade e aninhamento para redes gerais e de ectoparasito e aumento para endoparasitos, após a remoção de P. mesopotamicus, mostrando que os indivíduos nativos apresentam interações que alteram as métricas das redes. Sobre as extinções em cascata, não houve diferenças entre os hospedeiros. Reforça-se a importância de pesquisas sobre híbridos em ambientes naturais e sinaliza as preocupações com contaminação genética, vulnerabilidade quanto a infecção/infestação aos parasitos, e o declínio local da espécie nativa que é importante para as diferentes modalidades de pesca, com destaque para a de subsistência.Ph
Diversity and status of flatfish fishery at Balochistan Coast, Pakistan
No full textFlatfishes are one of the most diverse fishes of the order Pleuronectiformes and are found worldwide and constitute a large proportion of the ground fish catch. The flatfishes are commercially important species of Pakistan having high value and sold locally at higher prices as well as exported in large quantities. The present study aimed to examine the current status of flatfish fishery and their diversity in the coastal waters of Balochistan, Pakistan. These fishes were caught and landed in large quantities at different harbors of Balochistan coast. 3 species in Family Cynoglossidae, 3 species of family Paralichthyidae and 3 species from family Soleidae were recorded. The Cynoglossus arel and S. elongata were the most abundant species and collectively accounts for 82 % abundance in the total flatfish landings. Sur bandar and Pasni are the main fishing grounds for flatfish fishery at Balochistan coast. The highest catch was reported at Sur bandar in 2018 with 2227.99 and 14496.416 in 2019 and the lowest catch reported in Gaddani in 2019 with only 6.55 metric tons. The high demand and increasing catch of these fishes requires a management approach.PublishedReferee
Sistemática filogenética de Mesonauta Günther 1862 (Cichliformes: Cichlidae: Cichlinae).
No full textCichlids have evolved into models for studying the evolutionary history of Neotropical fish. Many authors attempted to recover the group's phylogeny using morphological and molecular data, presenting satisfying solutions across a wide range of genera. However, intrageneric relationships remain obscure in a number of genus, potentially complicating species delimitation. Mesonauta presents six distinct species that are highly valued by aquarists. Currently, there is no proposed phylogenetic relationship between its species; however, it has a wide geographic distribution and phenotypic variations, with the possibility of new species not yet described. Species of the genus were delimited using molecular and morphometric data from preserved and deposited species in ichthyological collections. From the six previously described species, COI delimitate different species, since two of them (Mesonauta egregius and M. guyanae) were not corroborated by delimitation analysis and two are putative new species, showing six different species: M. mirificus, M. festivus, Mesonauta sp. “Pantanal”, M. acora, Mesonauta sp. “Amapá” and M. insignis. The results showed a new basis for studies within the genus and further research is needed to understand the wide distribution of M. mirificus. Mesonauta's monophyly was tested and the relationships between species by constructing concatenated cladograms based on molecular characters (COI, 16S) using three phylogenetic methods, from which two main clades were recovered a new species of Mesonauta was described from the Amapá Grande river basin, based on morphological and molecular characteristics, in a region affected by the presence of mercury. This is the first step in investigating the molecular phylogeny of Mesonauta, which showed intrageneric relationships based on molecular data, enabled the description of a new species of the genus and provided information for future research on the evolutionary history of the group.Ciclídeos tornaram-se modelos para o estudo da história evolutiva de peixes da região Neotropical. Muitos autores têm tentado recuperar a filogenia do grupo com dados morfológicos e moleculares, apresentando resoluções satisfatórias entre muitos gêneros. Entretanto, as relações de parentesco intragenéricas ainda permanecem obscuras para vários gêneros, o que pode dificultar até mesmo a delimitação das espécies. Mesonauta apresenta seis espécies válidas, muito apreciadas pelos aquaristas. Atualmente não há nenhuma proposta filogenética de relações entre suas espécies e o gênero apresenta ampla distribuição geográfica e variações fenotípicas, com possíveis espécies novas não descritas. Foram delimitadas as espécies do gênero, a partir de dados moleculares e morfométricos de espécimes conservados e depositados em coleções ictiológicas. Das seis espécies descritas anteriormente, o COI delimita espécies diferentes, uma vez que duas delas (Mesonauta egregius e M. guyanae) não foram corroboradas pela análise de delimitação e duas são supostas espécies novas, mostrando seis diferentes espécies: Mesonauta mirificus, M. festivus, Mesonauta sp. “Pantanal”, M. acora, Mesonauta sp. “Amapá” and M. insignis. Os resultados mostraram uma nova base para estudos dentro do gênero e novas pesquisas são necessárias para entender a ampla distribuição de M. mirificus. Foi testado o monofiletismo de Mesonauta e as relações entre as espécies, com a construção de cladogramas baseados em caracteres moleculares (COI, 16S) utilizando três métodos filogenéticos, dos quais dois clados principais foram recuperados. Uma espécie nova de Mesonauta foi descrita da bacia do rio Amapá Grande, baseada em características morfológicas e moleculares, em uma região afetada pela presença de mercúrio. Este é o primeiro passo na investigação da filogenia molecular de Mesonauta, que mostrou relações intragenéricas baseadas em dados moleculares, possibilitou a descrição de uma espécie nova do gênero e forneceu informações para futuras pesquisas sobre a história evolutiva do grupo.Ph