Coordinated regulation of chromatophore differentiation and melanogenesis during the ontogeny of skin pigmentation of Solea senegalensis (Kaup, 1858)

Abnormal pigmentation of Senegalese sole has been described as one problem facing the full exploitation of its commercial production. To improve our understanding of flatfish pigmentation of this commercially important species we have evaluated eleven genes related to two different processes of pigmentation: melanophore differentiation, and melanin production. The temporal distribution of gene expression peaks corresponds well with changes in pigmentation patterns and the intensity of skin melanization. Several gene ratios were also examined to put in perspective possible genetic markers for the different stages of normal pigmentation development. Further, the phenotypic changes that occur during morphogenesis correspond well with the main transitions in gene expression that occur. Given the dramatic phenotypic alterations which flatfish undergo, including the asymmetric coloration that occurs between the ocular and the blind side, and the synchrony of the two processes of morphogenesis and pigmentation ontogenesis, these species constitute an interesting model for the study of pigmentation. In this study we present a first approximation towards explaining the genetic mechanisms for regulating pigmentation ontogeny in Senegalese sole, Solea senegalensis.Ministry of Science and Innovation (MICIIN) of the Spanish Government [AGL2008-03897-C04-01/ACU]; European Community [FP7/2007-2013-222719-LIFECYCLE]; Spanish Governmentinfo:eu-repo/semantics/publishedVersio

Ontogeny of the digestive enzyme activity of the Amazonian pimelodid catfish Pseudoplatystoma punctifer (Castelnau, 1855)

The aim of the study was to evaluate the functional ontogeny of the digestive system of Pseudoplatystoma punctifer through the analysis of the activity of the main intestinal (alkaline phosphatase, aminopeptidase N, maltase and leucine-alanine peptidase), pancreatic (trypsin, chymotrypsin, total alkaline proteases, bile-salt activated lipase and amylase) and gastric (pepsin) enzymes. Larvae were raised in triplicate in a recirculation system from 4 to 27 days post fertilization (dpf) at an initial density of 90 larvae L−1, 27.8 ± 0.7 °C and 0 L: 24D photoperiod. Larvae were fed from 4 to 17 dpf with Artemia nauplii and weaned onto an experimentally formulated feed (crude protein content ~ 45%; crude fat content ~ 10%; crude carbohydrate ~ 8%) within 3 days, then continued with the same diet until the end of the trial. P. punctifer showed an exponential growth pattern with two different growth rates: a slower one from hatching to 12 dpf followed by a faster one from 12 to 27 dpf. The specific and total activities of the pancreatic and intestinal enzymes were detected from hatching. The digestive system was functional at 12 dpf, indicating the transition from the larval to the juvenile stage (alkaline to acid digestion). Therefore individuals could be weaned from that day onwards. The variations observed in the enzymatic activity from 17 dpf reflected the adaptation of the enzymatic machinery to the new diet supplied. P. punctifer larvae showed a fast digestive system development with an enzymatic profile typical of a tropical and carnivorous species.info:eu-repo/semantics/acceptedVersio

Ceniza y lava: revelaciones científicas junto al volcán

Para la exposición se ha contado con el apoyo del Museo de la Ciencia y el Cosmos (La Laguna, Tenerife) del Cabildo de Tenerife, uno de los centros más visitados en la comunidad canaria por su enfoque interactivo de la divulgación científica. Ceniza y lava acerca el fenómeno geológico al público general para que experimente y comprenda la naturaleza, promoviendo la percepción de lo plausible en nuestro entorno y que adquiera conocimientos básicos para actuar. A diferencia de otros eventos divulgativos similares, esta exposición busca acercar a la población la experiencia investigadora implementada por tierra, mar y aire con sus hallazgos: materiales recopilados, metodologías utilizadas y conclusiones adquiridas, y lo hace de una manera inmersiva, interactiva y didáctica. La exhibición, programada del 29 de junio de 2023 al 30 de junio de 2024, permite ver, y en algunos casos manipular, materiales e instrumentos utilizados en las investigaciones y que por primera vez se han recopilado y museizado para ser exhibidos. Se compone de dos partes: 1) Ceniza y lava. En esta primera sala se recrea la erupción a través de diversos elementos: proyecciones impactantes, datos clave en una pared, línea del tiempo geológica de La Palma, visión nocturna de la erupción a gran escala, evolución diaria de las coladas sobre una reproducción 3D de la isla de 2 m de longitud y caleidoscopio inmersivo de un tubo lávico. 2) Revelaciones científicas. La transición de una sala a otra se realiza a través de una carpa, réplica de un puesto de mando avanzado que sirvió de zona de trabajo, reunión, atención a medios e incluso de descanso del personal investigador. En la segunda sala se accede a materiales, herramientas y descubrimientos realizados en la erupción desde las perspectivas de tierra, mar y aire. Esta exposición es fruto de la sinergia entre el personal científico de los centros CSIC en Canarias que se desplazó a la erupción y el de otras entidades como GE3BCN, el servicio de PRL del CSIC, el MUNA o el GES del Gobierno de Canarias, entre otros.Los equipos de investigación de los centros de la Delegación del CSIC en Canarias (IPNA, IEO e IGME) desempeñaron un papel crucial en la erupción de La Palma abordándola desde diferentes perspectivas: tierra, mar y aire. Su misión: entender el comportamiento del volcán y proporcionar información valiosa a las autoridades locales y equipos de emergencias para la toma de decisiones en gestión de desastres y protección de la población. Con idea de visibilizar este trabajo, esta labor se plasmó en una exposición 360° que es un testimonio poderoso de cómo la colaboración científica puede iluminar fenómenos naturales y su impacto en nuestra comunidad.FECYTOrganismo Autónomo de Museos y Centros de Tenerife (OAMC)Delegación del CSIC en CanariasPeer reviewedEnlace a la visita virtual de la exposición: https://meta.yonders.io/tour/museo-ciencia-y-cosmo

Feeding the future: the path towards nutrition-sensitive aquaculture

International audienceAquatic or blue foods, including a variety of fish, invertebrates, and algae, are pivotal for global food and nutritional security, contributing to 15% of animal and 7% of overall protein intake worldwide. Especially in lower-income nations, they form a significant portion of animal protein consumption. Despite their high nutritional value, including essential amino acids, fatty acids and micronutrients like iron, zinc, and vitamins, their importance is often overlooked in policy discussions and financial allocations, with less than 50% of national public health nutrition strategies and fisheries policies recognizing their significance. In many countries worldwide, the narrative has been primarily economy-centric, emphasizing high-value production for export over local food security and well-being.Over the last three decades, aquaculture production has rapidly increased to fulfill the rising demand for aquatic foods, given the stagnation in capture fisheries. However, for it to effectively contribute to global food security and livelihoods, it must operate sustainably. Although there's a positive trend towards sustainability in aquaculture, challenges such as habitat degradation, disease management, and environmentally unfriendly feed production persist. The narrative is gradually shifting towards a nutrition-sensitive approach in aquaculture, focusing on producing a variety of affordable, nutritious, and culturally appropriate foods sustainably. This approach envisions aquaculture as a means to enhance well-being, taking into account socio-economic, environmental, and cultural factors. It advocates for diversified and sustainable aquaculture production, evaluating the nutritional composition of aquatic organisms, and promoting sustainable feeding practices. Such a paradigm shift, aligning with the United Nations Sustainable Development Goals, positions aquatic foods as a promising avenue to address both nutritional needs and environmental sustainability, paving the way toward a more balanced food system

4° Coloquio Internacional RIIA "Red de Investigación sobre la Ictiofauna Amazónica" : Libro de Resúmenes

International audienceBook of abstracts of the 4th International Conference of The Research Network on Amazonian Ichthyofauna (RIIA) celebrated in Cochabamba, Bolivia

Brycon amazonicus (sábalo de cola roja) Perú

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Towards a more sustainable aquatic food system: Interdisciplinary research on sustainable marine aquaculture in Africa. Book of Abstracts

International audienceAquatic foods are a vital source of essential nutrients and contribute to food and nutrition security in many countries. By 2030, per capita fish consumption is expected to increase worldwide with the exception of Africa,due to population growth outpacing supply on this continent. Aquaculture has significantly expanded in Africa — mostly based on freshwater aquaculture —, but marine aquaculture production is one of the lowest in theworld.This conference, organised in the framework of the United Nations Ocean Decade Program AfriMAQUA (Nutrition-sensitive marine aquaculture in Africa), aims to bring together scientists from the South and the North from various disciplines to present their work on different aspects of the aquatic food system related to marine aquaculture in Africa. In addition, it will provide a platform for stakeholders with the mandate to contribute towards the development of Kenya’s marine aquaculture, including academia, government, industry, and civil society, to discuss and craft future scenarios of marine aquaculture and capacity development in Kenya. Moreover,AfriMAQUA will organize a training course that will target young university students in marine aquaculture

Colossoma macropomum (gamitana) Perú

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Arapaima gigas (paiche) Perú

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