Aquatic Commons
Not a member yet
22986 research outputs found
Sort by
Primeros datos sobre edad y crecimiento del pez palo brasileño Percophis brasiliensis (Piscis: Perciformes) en el Golfo San Matías, norte de la Patagonia (Argentina)
Get PDFEl pez palo brasileño Percophis brasiliensis es un pez perciforme de importancia comercial que se captura en forma incidental por los arrastreros en todo su rango de distribución latitudinal (de 23 ° S en Brasil a 47 ° S en Argentina). Está asociado con las capturas de merluza argentina Merluccius hubbsi y el camarón rojo patagónico Pleocticus muelleri en el Golfo de San Matías (SMG). El objetivo principal de este estudio fue describir los primeros datos sobre el crecimiento de esta especie en el SMG y comparar los resultados con la información disponible de otras áreas de la Plataforma Continental Argentina. El estudio se llevó a cabo en 294 especímenes (196 hembras, 97 machos y uno de sexo indeterminado) recolectados durante cuatro años no consecutivos de pesca comercial / recreativa y durante cruceros de investigación. La edad de los individuos se determinó leyendo y contando anillos opacos-hialinos en los otolitos sagittae. Las edades máximas observadas fueron 14 años para las hembras y 12 años para los machos. Los parámetros de crecimiento se estimaron utilizando el modelo de von Bertalanffy. Se encontraron diferencias significativas en el parámetro L∞ entre sexos (L∞ machos = 54.58; L∞ hembras = 78.31cm, p <0.05). Los parámetros de crecimiento fueron diferentes a los determinados en estudios previos para la Plataforma Continental Argentina
Supervivencia de vieira patagónica de talla no comercial descartada por la pesquería
Get PDFLa pesquería bentónica más importante en extensión y producción del Atlántico Sudoccidental es la de vieira patagónica (Zygochlamys patagonica). La desarrollan cuatro buques factoría con redes de arrastre de fondo no selectivas y planta procesadora a bordo. Durante el proceso de selección se retienen las vieiras de talla comercial (≥ 55 mm de alto total) y las que no la alcanzan (< 55 mm AT) se descartan al mar. El objetivo del presente trabajo fue determinar el nivel de supervivencia de los ejemplares descartados al mar y el efecto del proceso de selección a bordo. Se seleccionaron vieiras de talla no comercial procedentes de cubierta (control) y descarte (tratamiento). Se las clasificó de acuerdo con el nivel de daño y se las colocó en bolsas de polipropileno para fondearlas (~ 100 m de profundidad). Cuando se recuperaron los fondeos, a los 10 y 54 d, se contabilizó la cantidad de individuos vivos en cada bolsa. Los mayores niveles de supervivencia se registraron en ejemplares sin daño o con daño solo en los bordes; en aquellos con roturas o perforaciones en la valva el porcentaje fue cercano al 50%. Se observó que la supervivencia disminuía a medida que aumentaba el tiempo de la experiencia
Stock identification of Arabian yellow fin sea bream (Acanthopagrus arabicus) using shape of otolith in the Northern Persian Gulf and Oman Sea
Get PDFOtolith shape analysis is one way to identify stocks of different fish species in the marine environment. Length, width, area, perimeter, form factor, aspect ratio, roundness, circularity, ellipticity and rectangularity analyses of otoliths were undertaken to assess patterns of spatial and temporal stock structure of a wide-ranging fish, the Arabian yellow fin sea bream Acanthopagrus arabicus. Fish were sampled from 125 stations across the distribution range of the species in the Northern Persian Gulf and Oman Sea from June 2014 to May 2016. Analysis of morphometric parameters of otolith showed the minimum size in Khuzestan waters and the West Strait of Hormuz and the maximum size in the East Strait of Hormuz. In Bushehr waters, form factor showed the lowest and circular factor showed the highest frequency. These findings are in agreement with the irregularity in otolith margin of this area. The highest aspect ratio of otolith indicated higher growth in Khuzestan Waters. The thinner and longer otoliths were identified in the East Strait of Hormuz region. Further, rectangularity ratio factor in the Bushehr and West Strait of Hormuz waters was higher in comparison with other regions and this finding confirmed the quadrilateral otolith shape of this region. There are significant differences among otolith morphometric variables of the A. arabicus (p<0.05). The result of discriminant analysis on morphometric parameters indicated that 53/8 percent were in their geographic location accurately
Effect of using various amounts of patin (Pangasianodon hypophthalmus) fish oil on physical and chemical properties of moisturizing hand cream
Get PDFHand cream is used for rehydrating and improving skin properties. The skin is the first point of contact with the environment. Thus having healthy skin with proper barrier properties is quite important. The beneficial effects of fish oil on skin make it a favorable ingredient to be used in hand care products. In the present study, the efficacy and stability of various hand cream formulations using 0, 1.0, 2.5 and 5.0% of fish oil were investigated and compared. The appearance, odor, texture, and pH of formulations containing 1 and 2.5% of fish oil remained stable in very good qualities during the storage, whereas the related values to the appearance and texture of formulation containing 5.0% of fish oil at the end of 6 months of storage at 45°C were significantly (p<0.05) lower than other formulations and previous evaluations of this formulation. Weight loss was not observed in all formulations under study
SAMUDRA Report No. 81, June 2019
Get PDFSamudra Report No. 81, dated June 2019, features articles on fisheries from around the world, with a special focus on implementation of the the Voluntary Guidelines for Sustainable Small-Scale Fisheries (SSF Guidelines). The editorial Comment that opens the issue focuses on subsistence fisheries in the Western and Central Pacific region and their importance as a source of nutrition, culture and welfare for the communities living there. It notes that the course of action for the region is outlined in the SSF Guidelines, which need to be integrated into regional strategies and processes. An article from Cuba reports on a Fisheries Forum that brought together stakeholders from coastal communities to examine opportunities and challenges to make fisheries more sustainable, considering how vital fishing is for Cuba's economy and the livelihoods of its coastal communities. The geography, histories and cultures of the Pacific island region, and its 14 small island developing states, represent unique challenges and opportunities, argues another article. It notes that the introduction of the SSF Guidelines is an ambitious global-level policy pledge designed to provide overarching guidance towards improving the governance of small-scale fisheries around the world. The piece from Nigeria shows how waterfront communities, whose livelihoods are predominantly dependent on fishing and related activities, live under constant fear of eviction
Brazil: Kickoff time
Get PDFFishers from the Amazon region gathered to exchange ideas about common challenges and opportunities to sustain and develop indigenous fisheries in the light of the SSF Guideline
From the editor, Yemaya, No.59, June 2019
Get PDFWomen in fisheries and aquaculture are witnessing a curious paradox today. While on the one hand, women’s lack of visibility, capacity and resource access is being discussed increasingly and in ever-widening spaces, there is arguably little evidence that the response of national and international policy is in any way proportionate to the task of what needs to be done. This is worrying because precious time is being lost even as challenges, in terms of overfishing, tenure loss and climate impacts, continue to multiply. As a result, women in the sector run the risk of being pushed back into greater positions of exclusion and defensiveness. This exclusion in turn intensifies negative impacts on the sector
Mesh size selectivity of surface and mid-water gillnet for catching freshwater sardines “Sardinella tawilis” (Herre, 1927) in Taal Lake, Philippines
Get PDFTechnical information on the mesh size selectivity for tawilis fishery in Taal Lake is presently unknown or undocumented and different mesh sizes of gillnets are employed to exploit the species at various sizes. The study investigated the mesh size selectivity involving gillnet fishery for Sardinella tawilis using four different mesh sizes: 3.39 cm (10k), 3.05 cm (11k), 2.77 cm (12k), and 2.65 cm (12.5k). Fishing trials were conducted in Taal Lake, Philippines from October 2014 to September 2015. A total of 4,456 pieces of S. tawilis were caught with the length ranges from 8.5 cm to 14.5 cm mid-length. The seasonal changes in the gonadosomatic index (GSI) showed that S. tawilis spawns between March-May and August. Length at 50% maturity (L50) was estimated at 11.66 cm and used as the criterion for selecting the appropriate mesh size. The optimal length for each mesh size was estimated employing the Baranov-Holt method. The estimated optimal lengths of S. tawilis were estimated at 10.6 cm, 11.08 cm, 13.07 cm, and 14.53 cm for the mesh sizes of 12.5k, 12k, 11k, and 10k, respectively. Hence, the appropriate gillnet mesh size for S. tawilis corresponding to length at 50% maturity was 3.05 cm (11k)
The Small Pelagic Fisheries of Sarangani Bay, Southern Mindanao, Philippines
Get PDFHistorically, the waters of Sarangani Bay have rich fishing grounds. Fisherfolks depend mostly on fishing and have been the primary source of living. The study covered two municipal landing sites in Sarangani Province and one site in General Santos City, with its fishing ground in Sarangani Bay, to have information on the status of pelagic resources.
Results show a decreasing trend in catches of pelagic species from 92% in 2008 to 86% in 2012. The same decreasing trend can be seen in the number of species recorded compared to the previous study, from 401 species to 249. With regards to fishing gears used in the bay, there are five commonly used: multiple hook and line, scoop net, surface gill net, encircling gill net, and troll line.
Analysis of data was made using different analytical models contained in FiSAT II software. Growth parameters like maximum length (Lmax), K-values, total mortality (Z), natural mortality (M), fishing mortality (F), and exploitation ratio were computed using the length data.
Recruitment pattern analysis, virtual population analysis, and yield per recruit were also analyzed