Are negative intra-specific interactions important for recruitment dynamics? A case study of Atlantic fish stocks

2016 ◽  
Vol 547 ◽  
pp. 211-217 ◽  
Author(s):  
D Ricard ◽  
F Zimmermann ◽  
M Heino
Keyword(s):  
Specific Interactions ◽  
Fish Stocks

Assessment of fish stocks and economic value in accordance with fishway renovation: Case study of Samcheokoshipcheon0010 Weir

2020 ◽  
Vol 38 (1) ◽  
pp. 30-39
Author(s):  
Woon-Ki Moon ◽  
Dae-Yeul Bae ◽  
Do-Hyun Kim ◽  
Hyun-Beom Shin ◽  
Jung Bin Suh ◽  
...  
Keyword(s):  
Economic Value ◽  
Fish Stocks

Fish Habitat: Essential Fish Habitat and Rehabilitation

1999 ◽  
Keyword(s):  
Lake Erie ◽  
Habitat Management ◽  
Fish Habitat ◽  
Learning By Doing ◽  
Suitable Habitat ◽  
Physical Habitat ◽  
Fish Stocks ◽  
Habitat Features ◽  
Fish Habitats

<em>Abstract.—</em> The quality and quantity of habitats determine ecosystem productivity. Hence, they determine the potential fish productivity that sustains the fish harvests extractable from freshwaters and seas. Efforts to conserve and protect fish habitats are frustrated by key unanswered questions: which habitat types and how much must be protected to ensure natural self-sustaining fish stocks? Minns and Bakelaar presented a prototype method for assessing suitable habitat supply for fish stocks in Lake Erie, an analysis that can be used to address conservation issues. Here, the method is refined and extended, taking the assessment of habitat supply for pike <em>Esox lucius </em> in the Long Point region of Lake Erie as a case study. As with the previous study, much emphasis is placed on “learning by doing.” Because available inventories of habitat features are coarse and incomplete, improved guidelines for estimating habitat supply are expected from these prototype studies. The habitat supply method previously presented by Minns and Bakelaar is elaborated in three ways here: (1) the basic physical habitat assessment is derived from a remote-sensing inventory database; (2) methods of quantifying the thermal regime and integrating it with other habitat elements are examined; (3) habitat supply estimates are used in a pike population model, and pike biomass and production are simulated for the Long Point region of Lake Erie and then compared with available records. The roles of error and uncertainty are examined for all elements in the estimation and application of suitable habitat supply values. There is potential for supply measurement and analysis to guide fish habitat management.

scholarly journals Nudo territorial y desterritorialización indígena en Loma Campana (Neuquén, Argentina) desde 1963.

2021 ◽  
Author(s):  
Sabrina Aguirre
Keyword(s):  
State Policies ◽  
Oil Field ◽  
Specific Interactions ◽  
Economic Activities ◽  
Resistance Strategies ◽  
The Core ◽  
Vaca Muerta ◽  
Geological Formation ◽  
Complex Scenario

El escrito analiza cómo las políticas estatales provinciales configuraron nudos territoriales en la zona donde se ubica la comunidad Campo Maripe, al norte de Añelo, el corazón de la formación geológica Vaca Muerta. Se sostiene que estas políticas diseñaron los espacios impulsando territorialidades asociadas a determinadas actividades económicas y trajeron como consecuencia la desterritorialización indígena. La comunidad Campo Maripe, cuyo territorio actualmente se superpone parcialmente con el yacimiento hidrocarburífero Loma Campana -uno de los tres más relevantes en la extracción por métodos no convencionales-, ha sido seleccionada como caso de estudio en función de la notoriedad de sus estrategias de resistencia durante los últimos años. Se utilizan fuentes escritas y orales para caracterizar el complejo panorama de la superposición de territorialidades a partir de las políticas provinciales y el desarrollo de dinámicas específicas en las interacciones de los diferentes actores dentro de los nudos territoriales. The paper analyses how Neuquen’s state policies configured territorial knots in the area where the mapuce community Campo Maripe is located, in northern Añelo, the core of the Vaca Muerta geological formation. It is argued that these policies designed spaces boosting certain economic activities and their associated territorialities and brought indigenous deterritorialization as a consequence. The Mapuce community Campo Maripe, whose territory currently partially overlaps with the Loma Campana oil field -one of the three most important fields in the extraction of hydrocarbons by non-conventional methods-, has been selected as a case study due to how notorious its resistance strategies have become over the last few years. Written documents and oral testimonies are used to characterize the complex scenario of territorial overlapping caused by state policies and the development of specific interactions between the different actors within the territorial knots.

scholarly journals Cell selectivity correlates with membrane-specific interactions: A case study on the antimicrobial peptide G15 derived from granulysin

2006 ◽  
Vol 1758 (2) ◽  
pp. 154-163 ◽  
Author(s):  
Ayyalusamy Ramamoorthy ◽  
Sathiah Thennarasu ◽  
Anmin Tan ◽  
Dong-Kuk Lee ◽  
Carol Clayberger ◽  
...  
Keyword(s):  
Antimicrobial Peptide ◽  
Specific Interactions ◽  
Cell Selectivity

scholarly journals Insect-Based Feed Ingredients for Aquaculture: A Case Study for Their Acceptance in Greece

Insects ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 586
Author(s):  
Christos I. Rumbos ◽  
Eleni Mente ◽  
Ioannis T. Karapanagiotidis ◽  
Georgios Vlontzos ◽  
Christos G. Athanassiou
Keyword(s):  
Ecological Footprint ◽  
Fishing Pressure ◽  
Farmed Fish ◽  
Feed Ingredients ◽  
Fish Stocks ◽  
Fish Diets ◽  
Wide Range ◽  
European Aquaculture ◽  
The Eu

Although the inclusion of insects in fish diets is officially allowed in the EU since 2017, insect-based aquafeeds have not been widely adopted by the European aquaculture sector. In order to investigate the perceptions related with adoption trends, it is critical to explore the beliefs of people associated with the aquaculture sector on the use of insects in farmed fish diets. A survey was conducted among 228 participants of an aquaculture conference to explore their perceptions on the inclusion of insect meal in fish diets. Additionally, we investigated the attitudes of nine companies operating in the aquaculture and aquafeed sector in Greece that attended the conference towards this direction. The findings of the conference survey provide evidence that there is a wide-range awareness and acceptance regarding the use of insect-based feeds in farmed fish diets among the respondents. This is mainly driven by the expectations for the decline in fishing pressure on wild fish stocks, the reduction of the ecological footprint and the enhancement of the sustainability of the aquaculture sector. The results of the stakeholder survey show that six out of the nine companies that participated in the survey are favorably disposed towards the use of insect-based feeds. Specifically, four of them stated that they would produce or use aquafeeds based on insects. However, the results highlight the need for further research on the implementation of the wider adoption of insect-based feeds in aquaculture. The present study provides some first insights into the use of insect-based aquafeeds in Greece, for which there are no data available.

scholarly journals A multi-stock harvest control rule based on “pretty good yield” ranges to support mixed-fisheries management

2019 ◽  
Author(s):  
Dorleta Garcia ◽  
Paul J Dolder ◽  
Ane Iriondo ◽  
Claire Moore ◽  
Raúl Prellezo ◽  
...  
Keyword(s):  
Fisheries Management ◽  
Stock Assessment ◽  
Holistic Approach ◽  
Fishing Mortality ◽  
Fish Stocks ◽  
Control Rule ◽  
Harvest Control Rule ◽  
The Impact ◽  
Ecosystem Based Fisheries Management

Abstract Advice for commercially exploited fish stocks is usually given on a stock-by-stock basis. In light of the ecosystem-based fisheries management, the need to move towards a holistic approach has been largely acknowledged. In addition, the discard bans in some countries requires consistent catch advice among stocks to mitigate choke species limiting fisheries activity. In this context, in 2015, the European Commission proposed the use of fishing mortality ranges around fishing mortality targets to give flexibility to the catch advice system and improve the use of fishing opportunities in mixed-fisheries. We present a multi-stock harvest control rule (HCR) that uses single stock assessment results and fishing mortality ranges to generate a consistent catch advice among stocks. We tested the performance of the HCR in two different case studies. An artificial case study with three stocks exploited simultaneously by a single fleet and the demersal mixed-fishery operating in Bay of Biscay and Celtic Sea. The HCR produced consistent catch advice among stocks when there was only a single fleet exploiting them. Even more, the HCR removed the impact of the discard ban. However, in a multi-fleet framework the performance of the HCR varied depending on the characteristics of the fleets.

The role of fish farmers associations in aquaculture development in Uganda: case study of Walimi Fish Farmers Cooperative Society.

2020 ◽  
Author(s):  
John K Walakira ◽  
Nelly A Isyagi ◽  
Maurice Ssebusubi ◽  
William Leschen
Keyword(s):  
Rural Communities ◽  
Lessons Learned ◽  
Direct Access ◽  
Farmed Fish ◽  
Fish Stocks ◽  
Cooperative Society ◽  
Set Up ◽  
Aquaculture Development

Abstract The fisheries sector in Uganda provides employment, boosts national foreign exchange earnings, and offers a healthy source of protein. Main challenges facing the expansion and sustainability of the sector range from declining fish stocks in the natural water bodies to inconsistent supply to market chains. Development of aquaculture offers great potential to boost Uganda's fish processing capacity but is still limited by a poorly established supply through the market chain. Public-private partnership initiatives have reorganized fish farmers into viable groups that are focusing on filling gaps, thereby directly increasing economic and social benefits, especially to rural communities. Through WAFICOS, a fish farmers association formed in 2004, private sector linkages have been strengthened, fostering aquaculture development in Uganda. Since its formation in 2004, privately operated hatcheries have addressed problems of fish seed availability. The association has created markets for farmed fish products, thus stimulating aquaculture production. Members of WAFICOS, in March 2010, numbering 315, have direct access to advisory services, appropriate technologies, farm inputs, markets and credit facilities. This case study should be read as an illustrative example of how such a fish farmers' association was conceived, set up and its management and working infrastructure developed. From 2008, the Cooperative was supported and advised by the USAID Fish Project, very much with the objective of being a financially self-sustaining organization. Since its inception there have been a number of lessons learned from successes and failures. Time will tell whether the organization continues to develop and can remain financially viable to benefit its members.

scholarly journals Data-poor stock assessment of fish stocks co-exploited by commercial and recreational fisheries: applications to pike (Esox lucius) in the western Baltic Sea

2021 ◽  
Author(s):  
Rob van Gemert ◽  
Dieter Koemle ◽  
Helmut Winkler ◽  
Robert Arlinghaus
Keyword(s):  
Stock Assessment ◽  
Recreational Fishing ◽  
Recreational Fisheries ◽  
Fish Stocks ◽  
Explanatory Variables ◽  
Recreational Angling ◽  
Mixed Use ◽  
Stock Assessments ◽  
The Status

AbstractInformation on catch and effort of recreational angling in mixed-use fisheries (co-exploited by commercial and recreational fishers) is often scarce, preventing the application of data-rich stock assessments typically performed for industrialized commercial fisheries. Here, we show how data-poor stock assessment methods developed for marine fisheries, particularly a class of models labelled as “catch-only” models (COMs), offer a possible solution. As a case study, we use COMs to assess a northern pike stock around the German Baltic island of Rügen. We fit multiple COMs to a time-series of total pike removals, and use their outputs as explanatory variables in superensemble models. We conclude that the stock is fully exploited and currently declining. Our study highlights the potential for using COMs to determine status of previously-unassessed coastal and freshwater stocks facing recreational fishing pressure, and demonstrates how incorporating recreational removals is crucial for achieving reliable insights into the status of mixed-use stocks.

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