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A preliminary inventory of biodiversity and benthic habitats of “Plane” Island (Paloma) in Oran Bay, north western Algeria (western Mediterranean)
Get PDFFirst record of invasive green algae Caulerpa racemosa var. cylindracea in Oran Bay (Western Algeria)
Get PDFCaulerpa racemosa var. cylindracea (hereafter Caulerpa cylindracea) was first reported in the Mediterranean Sea in
1926 1 in Tunisian waters and then in Tripoli harbor in Libya, in 1990. In late 90s it invaded the southern shore of Europe. In
Algeria, this invasive species was reported for the first time in 20072, five years after it appeared about 450 km from the first
site in the eastern part of the Oranian littoral. This situation required widespread monitoring of this invasive species all along
124 km of the coastline. More than 10 stations were patrolled and monitored since then, studied by scuba diving between the
surface and 30 m depth.
The observations devoted to the distribution of Caulerpa cylindracea in Oran showed that specimens presented the same
appearance with irregularly entangled branched stolons attached to the substrate by colorless rhizoids from which the name
of the variety cylindracea was derived. Chronologically, the invasion direction seems to move from the bottom to the surface
with an orientation from east to west, in the Oranian coastline. In situ observations confirmed high propagation speed of
Caulerpe in the Oranian coastline where invasions were signaled in several stations. The seaweed was observed for the first
time in late 2011 and early 2012 (pers.obs) in Arzew Gulf (Cap Carbon) at the extreme east of the littoral, where the first
fronds were noticed. Then it extended geographically to the center of the coastline, in Kristel, early 2013. In 2014, it was
observed in Ain Turc and Cap Falcon. In 2015, it was observed in the western shoreline near Bousfer beach and in 2016 it
reached the “Plane” island (Paloma).
This alien species was encountered at depths ranging from a few centimeters in microcuvettes up to 37 m, on various
substrates (hard, sandy, muddy) between marine phanerogams rhizomes and, also between the lower mid-littoral and infralittorals
superior algae, with Posidonia oceanica herbarium. The study suggested a strong need for scientific monitoring and
management program, using optimized methodslike biological control or manual eradication for controlling the invasion
Age, growth and mortality of the common carp (Cyprinus carpio) population in Merdja Sidi Abed Dam, Algeria
Get PDFWe tried to estimate age, growth parameters, condition factor, length-weight relationship and mortality rates (Z, M, and F) of the common carp in Merdja Sidi Abed dam. Cyprinus carpio specimens were captured by long line between April and June 2013 in Merdjea Sidi abed. 220 individuals were collected and weights ranged between 265.5 and 620.3 g while the total length ranged between 26.3 and 35.6 cm. Length-converted catch curve was used to estimate total annual instantaneous mortality rates (Z), natural mortality was calculated using Pauly formula [ln(M) = -0.0152 - 0.279 ln(L∞) + 0.6543 ln(K) + 0.463 ln(T)]. Recruitment patterns were determined from the routine implemented in FISAT II. For all individuals (n = 220) of the common carp, the relationship between total length and body weight was: W = 0.0384 L2.70 (r2 = 0.906) for females and W = 0.0467 L2.653 (r2 = 0.976) for males a minor allometry was found for this species, mean condition factor K was estimated at 1.41. The maximum value of recruitment was recorded in March-April period with 19.56 and 15.20% respectively. The Battacharya method was used to estimate age of individuals that was comprised between 1 and years 3. The equation of Von Bertalanffy growth was: L = 36.75 [1-e-0.46 (t + 0.33)] for all the population. Total mortality (Z), natural mortality (M) and fishing mortality (F) were as follows: Z = 1.08, M = 0.82, F = 0.26 yr-1 while exploitation ratio (E) was evaluated at 0.24 indicating an under exploitation of this local resource
SSF guidelines: The Pacific ways
No full textThe geography, histories and cultures of the Pacific island region, and its 14 small island developing states, represent unique challenges and opportunities
Environmental NGOs: Amplifying fishers’ voices
No full textEnvironmental non-governmental organizations can work in partnership with fishing communities to secure vibrant fishing communities and thriving marine ecosystems. Abundant, biodiverse oceans and increased food and prosperity for small-scale fisheries are within our reach. There is an incredible groundswell of people and organizations working to realize the vision set forth in the FAO Voluntary Guidelines for Securing Sustainable Small-Scale Fisheries (SSF Guidelines), with small-scale fishing communities taking the lead in designing and implementing solutions. Environmental NGOs, including the Environmental Defense Fund (EDF) and the World Wide Fund for Nature (WWF), share the vision of thriving, healthy oceans and small-scale fisheries that provide sustainable and stable livelihoods for coastal communities, essential nutrients and a secure source of food for millions. Much has already been accomplished, yet it is clear that in order to achieve widespread impact, more could be done to amplify the efforts already underway by fishing communities
CBD: Ecology and equity
Get PDFThe UN Biodiversity Conference in Sharm El-Sheikh, Egypt, showed that sustainable development of fishing communities and participatory conservation of marine biodiversity are compatible. The 14th meeting of the Conference of the Parties (COP14) to the United Nations Convention on Biological Diversity (CBD) was held on 17-29 November 2018 in Sharm El-Sheikh, Egypt. Being the penultimate conference before meeting the deadline of the Strategic Plan for Biodiversity 2011-2020, adopted in Japan a decade ago, there was a lot at stake: Could the parties be rallied to deliver on their commitments under the Aichi Targets? Could they start developing an ambitious Post-2020 Global Biodiversity Framework, which will not only meet the Convention’s objectives of conservation, sustainable use and benefit-sharing, but also address the challenges presented by climate change to the health of our planet
Estado del conocimiento sobre el ciclo reproductivo y captación de postlarvas de mejillón del Género Mytilus en las costas de la Argentina
Get PDFEl trabajo consiste en una revisión de las investigaciones realizadas en Argentina sobre del ciclo reproductivo del mejillón Mytilus spp. y de la captación de sus postlarvas en colectores artificiales en ambiente natural. Su principal objetivo es unificar, sistematizar y discutir los resultados obtenidos durante las últimas cuatro décadas de estudios sobre el tema. El enfoque abarca la perspectiva biológica y biotecnológica vinculada al cultivo de esta especie en el país
In Memoriam: Edgardo Ernesto Di Giácomo, biólogo pesquero
Get PDFEdgardo se graduó de Licenciado en Zoología en la Universidad Nacional de La Plata (UNLP) en el 1977 y arribó a San Antonio Oeste el 17 de Julio de 1978, para trabajar como investigador en el Instituto de Biología Marina y Pesquera Almirante Storni. El Instituto se había creado solo cuatro años antes de su llegada y prácticamente estaba todo por hacerse. En esos primeros años de su carrera profesional tuvo a su cargo la organización del Laboratorio de Recursos Ícticos del Instituto y la realización de las primeras investigaciones orientadas al conocimiento de la biología y pesquería de la merluza del Golfo San Matías. Desde esa posición, trabajó en la planificación y ejecución de varios programas, proyectos y numerosas campañas de investigación pesquera, los cuales sentaron las bases científicas para la investigación y manejo de las principales pesquerías del golfo
Eco-translation of Local Knowledge in Developing a Trilingual Glossary of Fishing and Aquaculture
Get PDFThe eco-translation approach offers a new perspective to translate concepts in fishing and aquaculture. It focuses on ecological meanings of local knowledge (LK). Such knowledge, embedded in the local language, Hiligaynon, is used as an impetus for developing a trilingual glossary of fishing and aquaculture. Eco-translation becomes the theoretical springboard for translating Hiligaynon words in Filipino and English. The gathering of word tokens is informed by linguistic ethnography, a research method that focuses on the description of the community experiences, activities, and appreciation of its ecology. The LK is presented through the fisherfolk’s narratives of their cultural experiences, identification, and analysis of local fishing and aquaculture word tokens, along with its validation. The trilingual glossary highlights the concepts on preparations, harvesting, and marketing of fishing and aquaculture. Evidently, the community uses its LK through its language to create concepts for fishing and aquaculture that represent its own culture and ecological experiences
Comparison of metal uptake capacities of the brown algae Cystoseira barbata and Cystoseira crinita (Phaeophyceae) collected in Sinop, Turkey
Get PDFCystoseira barbata (Stackhouse) C. Agardh, 1820 and Cystoseira crinita Duby, 1830 widely distributed and dominant in the Black Sea collected from Sinop coastal zone to monitor the current situation of regional metal pollution during the 2015-2016. Macro-algae, sediments and seawater samples were analyzed for metal contents (Al, As, Cd, Co, Cu, Fe, Hg, Mn, Ni, Pb and Zn) using inductively coupled plasma mass spectrometry (ICP-MS). The methodology was provided by using standard reference material BCR 279 – Ulva lactuca. The general metal uptake of Cystoseira spp. displayed a tendency in the order of Hg2 and BCF>5000) that was a good indicator for Cystoseira species. As a result of measured values, it is seen that Sinop region is below the pollution level. The observed results of the elemental accumulation noticed that Cystoseira spp. could be used regularly as a bio-monitor of coastal pollution in the study area