Catch Strategy Research Articles

ANALISIS DAN STRATEGI PENGEMBANGAN USAHA PENANGKAPAN RAJUNGAN (Portunus pelagicus) DI DESA BONTO UJUNG KEC. TAROWANG KABUPATEN JENEPONTO

This study aims to see the feasibility of the small crab catcher and suitable indicators developed by fishermen in Bonto Ujung Village, Tarowang, Jeneponto district to maintain the availability of small crab resources in order to continue to provide benefits. This study uses a survey method by submitting a questionnaire to the respondents. The business feasibility data was analyzed using standard formulas that were generally available, while the small crab fishery business development strategy was analyzed by SWOT. The results showed that the crab fishery business using gill nets and traps that are currently available is still feasible to be used and developed. The strategy for developing small crab fishery business in Bonto Ujung Tarowang Village should take an effective catching strategy with a fishery information system, management arrangements, catching timing arrangements, increasing supervision with related parties, increasing knowledge of technology and information, increasing the marketing chain, increasing access to capital and access to information. to increase business opportunities, increase community innovation.

Optimal shape of the harvest control rule for different fishery management objectives

Abstract To determine the optimal shape of the harvest control rule (HCR) achieving common fisheries management objectives (maximizing the average catch, reducing the deviation of yields, and avoiding stock collapse) and ensure robustness to observation errors, we estimate the optimal values of biological reference points (BRPs) composing the HCR. While traditional HCRs usually consist of three BRPs based on the fishing mortality coefficient (F3-HCR), we introduce an alternative HCR defined by 21 BRPs based on the catch levels (C21-HCR) to cover various possible shapes of HCR including smooth ones. We compare the shape and the performance between the optimal C21-HCR and the optimal F3-HCR and conclude that the optimal HCR can be composed of the gradual combination of the basic strategies: the constant escapement strategy, the constant harvest rate (CHR) strategy, and the constant catch strategy. However, the current F3-HCR does not necessarily allow this combination and generally returns lower performance levels than the optimal C21-HCR (since the basic strategy is confined to CHR) excluding the range of low biomass. This result will provide a clear perspective to improve HCR according to the magnitude of assessment errors and to compromise multiple fisheries management objectives when various stakeholders are involved.

Coarse-to-Fine Visual Object Catching Strategy Applied in Autonomous Airport Baggage Trolley Collection

In this study, a systematic solution for mobile manipulation with the application of autonomous trolley collection in the airport is presented. The developed system features a novel integrated hardware and software system, incorporating a specially designed manipulator capable of tightly catching the trolley. Particularly, we innovatively present a supervisory control guided coarse-to-fine visual trolley catching strategy in large-scale airport environments. At the coarsest level, an image-based visual servoing method is utilized to approach the trolley from far to near, where a learning-based object detection method is adopted to identify trolleys in the environment in real-time. At the finest level, we present an accurate point cloud registration based object pose estimation method to promote the object manipulation with a position-based visual servoing controller. The tightly integrated system and the subsystems are evaluated through conducting experiments in the trolley collection task and comparing the key module with the state of the art. Extensive experiments demonstrate that the proposed framework can find and fetch the trolley robustly. Notably, the proposed object detection and pose estimation methods exhibit higher accuracy, providing credible perceptual approaches for mobile manipulation. Moreover, the proposed framework can be easily extended to other mobile manipulation tasks for object search and retrieval.

Comparing handline and trolling fishing methods in the recreational pelagic fishery in the Gulf of Oman

The choice of fishing gear and catching strategy should be taken into consideration in the management of fish stocks. Here, paired fishing trials in a pelagic recreational fishery compared the catch composition, catch rate and size selectivity between handline and trolling fishing methods in Iranian coastal waters of the Gulf of Oman. Total catch rate was 1.06 fish hr–1 vs 0.88 fish hr–1 for handline and trolling, respectively, a 17% difference which was significant (p < 0.05). Generally, the handline method captured more fish than trolling for most species, but size selectivity tended to be species-specific per gear type. The handline fishing method captured larger talang queenfish (Scomberoides commersonnianus), while trolling captured larger narrow-barred Spanish mackerel (Scomberomorus commerson), pickhandle barracuda (Sphyraena jello) and Indian threadfish (Alectis indicus). Technical measures, such as gear restrictions, could be applied to recreational pelagic fisheries management in the Gulf of Oman. Such measures could improve species-specific exploitation patterns.

Sosio-Ecological Dynamic of Small Scale Fisheries in Prigi Trenggalek

Small scale fishing is a very important part of the fisheries sector. Not only play an important role in enhancing food security, but also becomes an absorbent for workers without the need for educational. Actors in the small-scale fishery, as defined by Law 45 of 2009, are fishermen who fish their daily needs with the largest size of 5 (five) Gross Register Tonnes (GT) of fishing boats. The fishermen of Prigi are dominated by small fishermen, where the fleet is no larger than 5 GT. The number of small-scale fishing gear in Prigi exceeds 60% of the total gear. The dominance of small-scale fisheries promotes good management with long-term goals, namely the sustainability of fisheries. Today's management of fisheries management has shifted from conventional management to community-based management. In order to support the community-based management of fisheries management, various information about the community, which is the policy objective, is needed. To this end, small-scale fisheries research in Prigi and strategies for the adaptation of the extended fishery fisheries were carried out. The method used is the snowball sampling method and the calculation of the diversity of catching resources. Fishermen who are the subject of the research are small-scale fishermen who operate ships under 5 GT. The gear is stretch fishing, gillnets and tonda fishing rods. There are small fishermen in Prigi who have different types of gear that are used at that time depending on the season of the fish. The selection of fishing gear by fishermen is likely to be caused by different expertise, skills and experience of fishermen in the operation of fishing gears. In addition, the capital held by fishermen to produce fishing gear and the economic level of the fish caught will also likely affect the fishers in choosing the type of fishing gear used each day. The adaptation strategies of fishermen to unpredictable catches are divided into two groups, namely the catch strategy and the search for alternative sources of income.

A Cost-Effectiveness Analysis Comparing Clinical Decision Rules PECARN, CATCH, and CHALICE With Usual Care for the Management of Pediatric Head Injury

To determine the cost-effectiveness of 3 clinical decision rules in comparison to Australian and New Zealand usual care: the Children's Head Injury Algorithm for the Prediction of Important Clinical Events (CHALICE), the Pediatric Emergency Care Applied Research Network (PECARN), and the Canadian Assessment of Tomography for Childhood Head Injury (CATCH). A decision analytic model was constructed from the Australian health care system perspective to compare costs and outcomesof the 3 clinical decision rules compared with Australian and New Zealand usual care. The study involved multicenter recruitment from 10 Australian and New Zealand hospitals; recruitment was based on the Australian Pediatric Head Injury Rules Study involving 18,913 children younger than 18 years and with a head injury, and with Glasgow Coma Scale score 13 to 15 on presentation toemergency departments (EDs). We determined the cost-effectiveness of the 3 clinical decision rules compared with usual care. Usual care, CHALICE, PECARN, and CATCH strategies cost on average AUD $6,390, $6,423, $6,433, and $6,457 per patient, respectively. Usual care was more effective and less costly than all other strategies and is therefore the dominant strategy. Probabilistic sensitivity analyses showed that when simulated 1,000 times, usual care dominated all clinical decision rules in 61%, 62%, and 60% of simulations (CHALICE, PECARN, and CATCH, respectively). The difference in cost between all rules was less than $36 (95% confidence interval -$7 to $77) and the difference in quality-adjusted life-years was less than 0.00097 (95% confidence interval 0.0015 to 0.00044). Results remained robust under sensitivity analyses. This evaluation demonstrated that the 3 published international pediatric head injury clinical decision rules were not more cost-effective than usual care in Australian and New Zealand tertiary EDs. Understanding the usual care context and the likely cost-effectiveness is useful before investing in implementation of clinical decision rules or incorporation into a guideline.

Kansei Engineering Modelling for Packaging Design Chocolate Bar

Indonesia became the third largest cocoa producer in the world. However, the consumption of domestic chocolate is still very low. In order to increase the consumption of chocolate in Indonesia, we must to improve all aspects related to chocolate. Manage the right business processes modelling can improve overall Small and Medium Enterprises (SME) performance. Business Process Modeling Notation (BPMN) is an efficient method aligning an organization with the wants and needs of industry.. Nowadays, chocolate bar production is packaged by simple SME with a visual display that isn’t varied. To support customer preferences and build an identity that is embed in the minds of consumer, needs a comprehensive design oriented consumer perspective. Kansei Engineering selected because it’s able to connect gap between industry and consumer. This study aim to improve consumer preferences in chocolate bar product. Hypotheses were carried out on various chocolate bar indicate that changes of visual appearance will increase the acceptance of consumer. The methodology in this study consisted of four steps: Need analysis and system modelling, identification element design process, find kansei words and packaging design formulation. Data were collected by Term Frequency - Inverse Document Frequency (TF - IDF) and Quantification Theory Type (QTT) 1. The result of this research show that the formulation of new packaging design with eye catching strategy, make the color is red, the image is Milk, the typography is custom and the shape is attractive.

Management strategy evaluation using the individual-based, multispecies modeling approach OSMOSE

End-to-end ecosystem modeling platforms, including OSMOSE, are key tools for informing ecosystem-based fisheries management (EBFM). End-to-end models ideally implement two-way interactions between model components, yet two-way interactions between high trophic level (HTL) functional groups and humans (fisheries managers and fishers) are currently missing in OSMOSE. We developed a management strategy evaluation (MSE) framework for OSMOSE, which allows for feedback between HTL functional groups and fisheries managers. This framework couples OSMOSE to a management procedure integrating decision rules and accounting for scientific uncertainty and the acceptable risk of overfishing. We applied the MSE framework to the OSMOSE model of the West Florida Shelf, so as to conduct an evaluation of total allowable catch (TAC) strategies for red grouper (Epinephelus morio) in a context of episodic events of natural mortality. Our simulations indicate that TAC strategies that assume higher scientific uncertainty and/or lower acceptable risk of overfishing result in higher biomass-related metrics for red grouper. However, the levels of scientific uncertainty and acceptable risk of overfishing impose a trade-off between biomass-related and catch-related metrics for red grouper. Our simulations also indicate that updating red grouper TAC more frequently in a context of episodic events of natural mortality does not have a large impact on biomass-related and catch-related metrics for red grouper and other functional groups. The MSE we conducted for red grouper is strategic, and its outcomes, which were obtained under a specific set of assumptions, must be considered preliminary. We discuss how future research could help enhance understanding of the possible impacts of TAC strategies for red grouper. The MSE framework designed for OSMOSE links the dynamics of HTL functional groups to that of fisheries managers, thereby allowing OSMOSE to be better suited for informing EBFM. This framework is an invaluable asset in assessing the performance of fisheries management strategies, but could also be used for other purposes, such as the evaluation of research monitoring programs.

Increased Throwing Accuracy Improves Children's Catching Performance in a Ball-Catching Task from the Movement Assessment Battery (MABC-2).

The Movement Assessment Battery for Children (MABC-2) is a functional test for identifying deficits in the motor performance of children. The test contains a ball-catching task that requires the children to catch a self-thrown ball with one hand. As the task can be executed with a variety of different catching strategies, it is assumed that the task success can also vary considerably. Even though it is not clear, whether the performance merely depends on the catching skills or also to some extent on the throwing skills, the MABC-2 takes into account only the movement outcome. Therefore, the purpose of the current study was to examine (1) to what extent the throwing accuracy has an effect on the children's catching performance and (2) to what extent the throwing accuracy influences their choice of catching strategy. In line with the test manual, the children's catching performance was quantified on basis of the number of correctly caught balls. The throwing accuracy and the catching strategy were quantified by applying a kinematic analysis on the ball's trajectory and the hand movements. Based on linear regression analyses, we then investigated the relation between throwing accuracy, catching performance and catching strategy. The results show that an increased throwing accuracy is significantly correlated with an increased catching performance. Moreover, a higher throwing accuracy is significantly correlated with a longer duration of the hand on the ball's parabola, which indicates that throwing the ball more accurately could enable the children to effectively reduce the requirements on temporal precision. As the children's catching performance and their choice of catching strategy in the ball-catching task of the MABC-2 are substantially determined by their throwing accuracy, the test evaluation should not be based on the movement outcome alone, but should also take into account the children's throwing performance. Our findings could be of particular value for the development of simple but informative catching assessments, and may provide additional insights into the causes of performance deficits in ball catching.

Model selection for determining the growth of juveniles and sub-adults of two species of shrimp (Decapoda, Penaeidae) in a tropical coastal lagoon

To select the model that allows the growth curves of juvenile and sub-adult shrimp to be described more accurately, a study was carried out in a coastal lagoon in the south of the Gulf of Mexico on the speciesFarfantepenaeus brasiliensis(Latreille, 1817) andFarfantepenaeus duorarum(Burkenroad, 1939). The data were obtained from 11 monthly samplings, taken between April 2011 and February 2012, applying the catch strategies used by the local fishermen, including the fishing gear used. The carapace length (CL)-total weight (TW) relationship was estimated for both species. Frequency analyses were performed in order to follow the best represented cohorts over time and fit three non-asymptotic growth models: Power, Generalised Schnute and the Indeterminate Tanaka model. The CL-TW relationship of juvenile and sub-adultF. brasiliensiswas TW = 3 × 10−5CL3.75and TW = 8 × 10−5CL3.50forF. duorarum, both of which presented positive allometric growth. In both species the Indeterminate Tanaka model proved to be the best fit to the modal groups of the juvenile and sub-adult shrimp due to its ability to describe the seasonal oscillations in shrimp growth.

Skill learning based catching motion control

AbstractLearned biomechanical strategies prepare the human body in kinematics and kinetics terms during interception tasks, such as throwing and catching, in real world. Based on this, we present a real‐time physics‐based approach that generates natural and physically plausible motions for a highly complex task ball catching. We showed that ball catching behavior could be achieved with the proper combination of rather simple motor skills, such as standing, walking, and reaching. The character learns some policies to know how and when to react by using reinforcement learning in order to use time accurately. We demonstrate the effectiveness of our method with some of the catching animation results in different catching strategies. Copyright © 2015 John Wiley & Sons, Ltd.

A System Analysis and Design for Packaging Design of Powder Shaped Fresheners Based on Kansei Engineering

Natural fresheners such as tea, coffee and chocolate that stimulate the nerve response to more active resulting in fresher effect for the user. Most of tea are processed as powder shaped. Currently tea powder still used the traditional packaging which incompetence with international competitor. To support customer preferences and to improve sales of tea powder product, the packaging design must be attractive. Main contribution of this research were to identify the design element of packaging design, identify packaging design on Kansei words and formulate the new packaging design. Kansei Engineering were useful in creating a new invented product in order to bridge the desired product characteristics for consumer's perception. The process modelling phase for system analysis and design starts from Business Process Model and Notation (BPMN) to get the improvement of packaging functionality, usability and pleasurable. Data and information were acquired by questionnaires. The methods of Kansei words with TF-IDF, and formulation of packaging design with QTT1 approach. The result of this research show that the formulation of new packaging design with eye catching strategy, make the color is green, the image is cup, the typography is custom and the shape is attractive.

Evaluating alternative management strategies for bigeye tuna, <i>Thunnus obesus</i>, in the Indian Ocean

Bigeye tuna ( Thunnus obesus ) support a large commercial fishery in the Indian Ocean. However, explicit management strategies and harvest control rules are yet to be developed for the management of this fishery. We used a stochastic age-structured production model as an operating model to evaluate several potential management strategies under different assumptions of stock productivity. Five management strategies—constant fishing mortality, constant catch, quasi-constant catch, constant escapement, and status-dependent strategies—were evaluated and compared using the performance indicators including average catch, average spawning stock biomass, variation in catch, average fishing mortality and lowest biomass during the time period considered in the simulation. This study shows that (1) for the constant catch strategy, an annual catch of 90000 t would result in a low risk of stock being overfished while obtaining a stable catch; (2) for the constant fishing mortality strategy fishing mortality of 0.3 per year could yield a higher catch, but might have a high probability (64%) of stock dropping below the spawning stock biomass (SSB) that could achieve maximum sustainable yield ( SSB msy ); and (3) for the quasi-constant catch strategy an annual catch of 110000 t was sustainable if the current SSB was higher than SSB msy . Constant escapement and status-dependent strategies were robust with respect to different levels of virgin recruitment and steepness. This study suggests that it is important to incorporate uncertainties associated with key life history, fisheries and management processes in evaluating management strategies.

Analysis of artisanal fisheries in two reservoirs of the upper Paraná River basin (Southeastern Brazil)

We compared the artisanal fisheries, in terms of catch strategies, productivity, and gross per capita income, at two reservoirs: the Barra Bonita (an eutrophic reservoir with some introduced species), and the Jurumirim (an oligotrophic reservoir, with no introduced species). Published data and structured interviews with fishers were used to evaluate fishing activity, fish biomass, and the financial performance of the fisheries. In the Barra Bonita Reservoir we analysed data from 745 fishing trips, from which 86,691.9 kg of fish were landed, with a mean CPUE of 62.4 kg/fisher-1 day-1. The main type of fish caught was tilapia (71,513.5 kg; CPUE of 51.5 kg/fisher-1 day-1), which constituted 82.5% of the biomass caught. In the Jurumirim Reservoir, we analysed data from 2,401 fishing trips, from which 25,093.6 kg of fish were landed, with a mean CPUE of 10.4 kg/fisher-1 day-1. The main type of fish caught was "traíra" (6,158.6 kg; CPUE of 2.6 kg/fisher-1 day-1), which constituted 24.5% of the biomass caught. Ordination analysis (PCA) indicated that there was a difference in composition between the fishing reservoirs and ANCOVA showed that there was a significant difference in fish production between the reservoirs. A Student's t-test showed that fishers in the Barra Bonita Reservoir had a significantly higher gross per capita income than those from the Jurumirim Reservoir. Although the Barra Bonita Reservoir has a higher fish production and the fishers earn a higher gross per capita income, we recommend the Jurumirim Reservoir as a model for artisanal fishery management because fishing activity in this reservoir is viable in the long term and such a model would promote conservation and sustainability. This contrasts with the Barra Bonita Reservoir, in which the fishery is not viable in the long term, due to environmental problems caused by artificial eutrophication and the introduction of alien species. It is also noted that in many countries, management of fisheries based on exotic species has not been viable in the long term.

The “prawn-in-the-tube” procedure: What do cuttlefish learn and memorize?

For several decades the “prawn-in-the-tube” procedure has been extensively used in the exploration of behavioral plasticity and its neural correlates in cuttlefish. Although the nature of the task has been characterized, the effect of reinforcement and the extent of different cues cuttlefish can use to solve and memorize the task remain unclear. To determine whether cuttlefish learned to inhibit predatory behavior because of pain incurred when the tentacles hit the glass tube, the shrimp prey (typically attacked with a tentacle strike) was replaced by crabs (normally caught by a jumping strategy, using all eight arms together, which is thought less likely to be painful). We showed that the cuttlefish is still capable of learning inhibition of predatory behavior when it adopts another catching strategy, which suggests that pain from the tentacles hitting the tube has little effect on the learning process. The two latest experiments have shown that cuttlefish do not learn to inhibit predatory behavior towards a specific type of prey, but rather learn and memorize visual (light polarization) and tactile information from the glass tube.The “prawn-in-the-tube” procedure is a powerful and user-friendly tool in the investigation of the processing and retention of multisensory information in invertebrates. Our recent findings now open up new areas of investigation into the neural correlates of learning and memory processes in cuttlefish.

2P2-P03 逆再生動作を用いた高速キャッチングのための実時間軌道生成(感覚・運動・計測)

High-speed manipulation has great potential to produce new robotic skills utilizing the feature of high-speed motion. Based on the concept, we had achieved high-speed throwing motion using a hand-arm system as a example. In the research, we proposed a throwing strategy using the motion called "Kinematic chain" that we can observe in human throwing motion. On the other hand, There are many research about robotic catching. And there are strategies to minimize the difference in the velocity of ball and manipulator. We consider that we can achieve catching a faster ball by applying the throwing strategy. Because by using the strategy, we can move the arm at high speed. In this paper, we propose a catching strategy using the inverse motion of the throwing strategy. And we implemented the proposed strategy into the experimental system, and a high-speed manipulator caught a ball moving on plane.

Pd catalysts immobilized onto gel-supported ionic liquid-like phases ( g-SILLPs): A remarkable effect of the nature of the support

New polymeric materials containing functional sites analogous to ionic liquids have been synthesized. Those materials are a supported reservoir for the active Pd species. Their catalytic activity has been evaluated for the Heck reaction proving an excellent performance in terms of both activity and recyclability. Although soluble Pd species seem to participate in the catalytic cycle, as for many other supported Pd-systems, the g-SILLPs present the ability to efficiently release and recapture those soluble species. This allows to dramatically reduce or eliminate the amount of Pd leached to the final solution, in particular at higher temperatures, and opens the way, based on a release and catch strategy, for the development of active-supported Pd catalytic systems, easily recoverable and reusable for a large number of catalytic cycles. The exact nature of the polymer (SILLPs) has a remarkable influence on the overall process. The appropriate design of the g-SILLPs is a key factor for the optimization of the release and catch system. The functionalized polymers prepared can be reused for a significant number of catalytic cycles without any loss in performance.

Immediate maximum economic yield; a realistic fisheries economic reference point

Abstract Lleonart, J., and Merino, G. 2010. Immediate maximum economic yield; a realistic fisheries economic reference point. – ICES Journal of Marine Science, 67: 577–582. Unregulated or poorly managed fisheries tend towards overexploitation, but fisheries rent does not completely dissipate when immediate rent maximization is sought. The principle of immediate economic rent maximization is the basis of the derivation of a classic model and has led to the definition of a relationship in a catch-and-effort diagram termed the dynamic immediate maximum economic yield (DIMEY) curve. For any initial biomass, if the economic rent in the immediate fishing season is maximized, then the fishing effort and catch strategy that follows will be located on the DIMEY curve. The DIMEY curve is not only used for dynamic simulation but also used to identify a new reference point, the immediate maximum economic yield (IMEY), which is proposed as more realistic than the classic open-access solution for unregulated fisheries. IMEY is proposed as an asymptotic outcome for unregulated or poorly managed fisheries when short-term economic objectives drive fleet activities. IMEY properties are described and compared with traditional fisheries reference points in the yield-and-effort diagram. Theoretical conclusions are compared with empirical evidence provided by the red shrimp fishery off Blanes, Spain (NW Mediterranean). Observed catch-and-effort records are plotted and were positively correlated with the DIMEY curve and IMEY.

Developing a Bayesian framework for stock assessment and decision analysis of the red sea urchin fishery in Baja California, Mexico

The red sea urchin (Strongylocentrotus franciscanus) fishery is of importance to the economy of Baja California (Mexico). The commercial fishery started in the early 1970s as a result of expanding export markets, but has experienced substantial decline in landings and abundance since 1986. Fishery-independent surveys have not been conducted for all fishing areas, thus CPUE and catch data were used to conduct a stock assessment and decision analysis for the red sea urchin stock. The red sea urchin population dynamics was described with the Schaefer biomass dynamic model. Bayesian approaches were used for the estimation of the model parameters and for projecting the population dynamics of the species under different management scenarios, including constant harvest rate and constant catch strategies. This study suggests that the current stock is only 17% of the virgin stock biomass and that, for a constant catch policy, a 10% increase in the current catch rate could potentially cause the collapse of the fishery in 20 years. Simulation results suggested that a constant harvest rate between 15% and 25% would cause the population to recover and maximize the catch in 2024. Higher harvest rate levels would increase the probability of the biomass being less than 40% of the population carrying capacity.

Multi-Robot Hunting in Dynamic Environments

This paper is concerned with multi-robot hunting in dynamic environments. A BCSLA approach is proposed to allow mobile robots to capture an intelligent evader. During the process of hunting, four states including dispersion-random-search, surrounding, catch and prediction are employed. In order to ensure each robot appropriate movement in each state, a series of strategies are developed in this paper. The dispersion-search strategy enables the robots to find the evader effectively. The leader-adjusting strategy aims to improve the hunting robots' response to environmental changes and the outflank strategy is proposed for the hunting robots to force the evader to enter a besieging circle. The catch strategy is designed for shrinking the besieging circle to catch the evader. The predict strategy allows the robots to predict the evader's position when they lose the tracking information about the evader. A novel collision-free motion strategy is also presented in this paper, which is called the direction-optimization strategy. To test the effect of cooperative hunting, the target to be captured owns a safety-motion strategy, which helps it to escape being captured. The computer simulations support the rationality of the approach.