scholarly journals Comments on the evidence for the recent claim on the state of Australian fish stocks

2019 ◽  
Vol 29 (2) ◽  
pp. 329-330 ◽  
Author(s):  
L. Richard Little ◽  
Jemery Day ◽  
Malcolm Haddon ◽  
Neil Klaer ◽  
Andre E. Punt ◽  
...  
Keyword(s):  
The State ◽  
Fish Stocks ◽  
Australian Fish ◽  
Recent Claim

scholarly journals Costs and Returns of Fishermen in the Massachusetts Inshore Lobster Fishery

1975 ◽  
Vol 4 (2) ◽  
pp. 195-210 ◽  
Author(s):  
J. M. Gates ◽  
J. M. D'Eugenio
Keyword(s):  
Fisheries Management ◽  
Fishing Effort ◽  
The State ◽  
Economic Factors ◽  
Sufficient Criterion ◽  
Fish Stocks ◽  
The Past ◽  
Resource Managers ◽  
Lobster Fishery

The inshore lobster fishery is one of the more important ones in the Commonwealth of Massachusetts, accounting for approximately 14 percent of the total landed value of all species in Massachusetts in 1971. Until recent years this fishery accounted for virtually all the pot landings in the state. Despite numerous attempts at conservation such as gear regulation, size restrictions, and prohibitions on harvesting egg-bearing females, the fishery has been subject to rapidly increasing effort and virtually constant landings. In the past decade it has become obvious to many fishery biologists and economists that conservation of fish stocks is a necessary but not sufficient criterion for fisheries management. Resource managers have become increasingly aware of the interdependence between economic factors and the intensity, location and composition of fishing effort.

Recommendations on reintroduction of crustaceans and fish, use of fish stocks, and improvement of the state of Lake Drūkšiai

2014 ◽  
Vol 24 (2) ◽  
pp. 185-186
Author(s):  
Vytautas Kesminas ◽  
Vasil V. Vezhnavets ◽  
Jūratė Kasperovičienė ◽  
Vladimir M. Baichorov ◽  
Andrius Steponėnas ◽  
...  
Keyword(s):  
The State ◽  
Fish Stocks

scholarly journals The current state of fishing and extracting the living aquatic resources in the Black Sea region of Ukraine

2019 ◽  
Vol 2 (3) ◽  
pp. 23-27
Author(s):  
M. I. Burgaz ◽  
T. I. Matviienko ◽  
O. M. Soborova ◽  
K. I. Bezyk ◽  
O. Y. Kudelina
Keyword(s):  
Black Sea ◽  
Fish Farming ◽  
The State ◽  
Water Bodies ◽  
The Black Sea ◽  
Aquatic Resources ◽  
Black Sea Region ◽  
Fish Stocks ◽  
Current State ◽  
Inland Water Bodies

The development of open spaces and resources of the Black Sea is one of the main directions of the Black Sea region (the Odessa, Mykolaiv and Kherson regions). The essence of the region policy allows to cooperate with the most countries of the world community and brings an income both to the budget of the regions and to the state budget. Industrial fisheries is an extractive branch of the fishing industry that uses the natural resources of the oceans, seas, lakes, rivers, reservoirs: various species of fish, marine mammals, shellfish, crustaceans and aquatic vegetation. Fisheries can be considered as one type of nature using which consists in the extraction of fish and other sea products (fish, invertebrates, algae, etc.). The purpose of the work was to find out a current state of fishing and extracting the living aquatic resources in the Black Sea region, namely in the Odessa, Mykolaiv and Kherson regions. An assessment of a current state of extracting the aquatic bioresources in general and in the inland water bodies in the Black Sea region, namely in the Odessa, Mykolaiv and Kherson regions for the period from 2010 to 2018, was carried out on the basis of specialized literature. The state of extracting the aquatic bioresources in general and in the inland water bodies from 2010 to 2018; the amount of caught fish in this region; the state of fisheries of the studied region were investigated. Fish farming is a branch of the national economy that is engaged in farming, increasing and improving a quality of the fish stocks in the water bodies and filling the fish resources. In order to maintain and increase the stocks of valuable industrial fish in our country the extensive measures for artificial fish farming, improving the conditions of natural reproduction of fish, as well as the development of lake and pond fisheries for the commercial fish production are being taken. Much work is being done to acclimatize valuable industrial fish species and other fishing objects, aimed at expanding a fish species composition and increasing the fish stocks. It was found that according to the statistics of the State Statistics Committee of Ukraine, the analysis of the exraction of fish and aquatic biological resources in the Black Sea region (Odesa, Mykolaiv and Kherson regions) showed that an increase in the volume of fish catching and extracting the living aquatic resources occurred only due to inland waters.

scholarly journals When is a fish stock collapsed?

2018 ◽  
Author(s):  
J Yletyinen ◽  
WE Butler ◽  
G Ottersen ◽  
KH Andersen ◽  
S Bonanomi ◽  
...  
Keyword(s):  
Life Histories ◽  
The State ◽  
Systematic Evaluation ◽  
Occurrence Rate ◽  
Fish Stock ◽  
Policy Makers ◽  
Fish Stocks ◽  
The Public ◽  
Population Turnover

AbstractMarine fish stock collapses are a major concern for scientists and society due to the potentially severe impacts on ecosystem resilience, food security and livelihoods. Yet the general state of harvested fish populations has proven difficult to summarize, and the actual occurrence rate of stock collapses remains unclear. We have carried out a literature review and multi-stock analysis to show that numerous definitions exist for classifying stocks as collapsed, and that the classification of a stock’s status is sensitive to changes in the collapse definition’s formulation. We suggest that the lack of a unified definition has contributed to contrasting perceptions on the state of fish stocks. Therefore, we comprehensively define what constitutes a fish stock collapse and provide a time-series based method for collapse detection. Unlike existing definitions, our definition is process-based, because it links together three important phases of collapse events: the abrupt decline, an ensuing period of prolonged depletion, and potential recovery. Furthermore, these phases are specified in terms of population turnover. Through systematic evaluation, our definition can accurately distinguish collapses from less severe depletions or natural fluctuations for stocks with diverse life histories, helping identify the stocks in greatest need of reparatory measures. Our study advocates the consistent use of definitions to limit both alarmist and conservative narratives on the state of fish stocks, and to promote cooperation between conservation and fisheries scientists. This will facilitate clear and accurate communication of science to both the public and to policy-makers to ensure healthy fish stocks in the future.

scholarly journals Actual status of fishing reserves of the Yesil River

2019 ◽  
Vol 36 ◽  
pp. 1-9
Author(s):  
Zhumagazy Kurzhykayev ◽  
Kuanysh Syzdykov ◽  
Ainur Assylbekova ◽  
Dinara Sabdinova ◽  
Viktor Fefelov
Keyword(s):  
Biological Diversity ◽  
Biological Indicators ◽  
The State ◽  
Reference Points ◽  
Boundary Values ◽  
Sustainable Fisheries ◽  
Fish Stocks ◽  
Fish Resources ◽  
Managerial Decisions ◽  
Careful Management

In this article, the study and prediction of the state of fish resources in the Yesil River was carried out to determine the boundary reference points of the reserve and management decisions in case they are exceeded, to ensure sustainable fisheries and preserve biological diversity. Ichthyological studies, retrospective analyses and rankings of the effects of the water supply of the Yesil River on fish stocks have been carried out, critical values ​​of the biomass of fishing reserves have been determined, as criteria for biologically safe fishing values and targets for management of fish stocks at reaching the boundary values ​​of 24.03 tonnes have been established. According to the results of studies of basic biological indicators, it was determined that roach, bream, pike and perch populations each had an LC50 above LM50, which indicates their low utilization in the fishery industry. A strategy for management of fish stocks, recommendations for the conservation of fishery resources and their rational use has been developed as a result of these findings. The list and status of the monitored indicators for the careful management of fish stocks, as well as a list and indicators of the boundary indicators for the state of fish stocks, was established. These parameters included the fish size of 50% of the sampled fish and 50% of maturity achieved, where the LC50 was observed in the fish in question from 19 to 45.4 cm and LM50 from 12.3 to 41 cm, respectively. The minimum and maximum river levels that ranged from 111 up to 159 cm, as well as the critical value of the commercial reserve, corresponded to the boundary value of 24.03 tonnes. The results of this work will serve as the basis for making future managerial decisions, necessary for sustainable fisheries and conservation of the biological diversity of the Yesil River.

scholarly journals The Importance of Involving Stakeholders and Scientists in the Management of Marine Fisheries

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Anthony D. Hawkins
Keyword(s):  
Fisheries Management ◽  
The State ◽  
Expert Advice ◽  
Fish Stock ◽  
Government Agencies ◽  
Aquatic Environments ◽  
Fish Stocks ◽  
Stock Assessments ◽  
Set Up ◽  
European Regional

In recent years there has been increasing concern over the state of fish stocks, especially those that support key fisheries and supply food to many consumers. There is also concern over the state of aquatic environments, and the effects of climate change. Fisheries management is controlled by government agencies, often cooperating with similar agencies from other nations. This paper deals with the need for expert advice on fisheries, involving fishers as well as scientists. Mention is made of a Fisheries Partnership set up in Europe, bringing fishers and scientists together with other stakeholders to discuss the problems of managing fish stocks. The partnership was especially successful in improving relationships between fishers and scientists, and made significant improvements to some fish stock assessments. European Regional Advisory Councils were later established to play a similar role. They are providing significant advice on fisheries, but they do not yet play a key role in actual management. It is important to consider how stakeholders and scientists can become more actively involved in fisheries management. There is a crucial need to develop new, more participatory ways of managing fisheries.

Managing fish stocks under climate uncertainty

2005 ◽  
Vol 62 (7) ◽  
pp. 1531-1541 ◽  
Author(s):  
Brian J. Rothschild ◽  
Changsheng Chen ◽  
R. Greg Lough
Keyword(s):  
Decision Theory ◽  
Fishery Management ◽  
Causal Chain ◽  
The State ◽  
Population Characteristics ◽  
Fish Stock ◽  
Fish Stocks ◽  
Formal Framework ◽  
Past Data ◽  
State Of The Environment

Abstract The quantitative evaluation of the management of fish stocks under uncertainty requires a formal framework. Decision theory provides that framework. Application of decision theory to fishery management requires information about both the fish stock and the state of the environment. Using Georges Bank haddock as a case study, it is possible to determine the probability of good or poor recruitment using past data and a constant environment. Understanding the state of the environment is more difficult, however, because fixed levels of recruitment, in particular, are associated with different population characteristics, which drastically reduce the sample size for any particular recruitment–environment scenario. Decision theory challenges us to improve our capability of predicting the state of nature, and it appears that this can be accomplished best by reducing the length of the causal chain, a goal now made feasible by the availability of high-resolution, high-frequency ocean models.

The intersection of potential energy surfaces in polyatomic molecules

1975 ◽  
Vol 344 (1637) ◽  
pp. 147-156 ◽  
Keyword(s):  
Wave Function ◽  
Potential Energy ◽  
Electronic State ◽  
Configuration Space ◽  
Potential Energy Surfaces ◽  
Polyatomic Molecules ◽  
The State ◽  
State Changes ◽  
Energy Surfaces ◽  
Recent Claim

It is proved that if the wave function of a given electronic state changes sign when transported adiabatically round a loop in nuclear configuration space, then the state must become degenerate with another one at some point within the loop. I t is further shown that this condition is satisfied by certain unsymmetrical triatomic systems, thereby disposing of a recent claim that the non-crossing rule for diatomic molecules applies also to polyatomic molecules.

scholarly journals Evolution of the state of fish stocks in the Northeast Atlantic within a precautionary framework, 1970–2003: a synoptic evaluation

2005 ◽  
Vol 62 (8) ◽  
pp. 1603-1608 ◽  
Author(s):  
S.M. Garcia ◽  
J.I. De Leiva Moreno
Keyword(s):  
Time Lag ◽  
The State ◽  
Reference Points ◽  
Fishing Mortality ◽  
Fish Stocks ◽  
The North ◽  
Value Judgements ◽  
The Status ◽  
The Mean ◽  
Spawning Biomass

Abstract The state and trajectory of some of the stocks assessed by ICES in the North Atlantic in the period 1970–2003 are synoptically represented on a single system of representation of fishing mortality and biomass with precautionary reference points used as limits and thresholds. The results indicate that for nearly 30 years, the status of the stocks in relation to the precautionary reference points has been degrading in terms of spawning biomass and excess fishing mortality, driving most resources down close to and often beyond those reference points. The situation seems to have improved during the past decade, with some exceptions, as shown by progressive shift of the mean position of the stocks away from excessive mortality (since the early 1990s) and, after a time-lag, away from low biomass (since the early 2000s). The proposed representation system sticks to the reference points and value judgements used in the ICES context, but could be used with any equivalent precautionary system of representation.

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