Terrestrial animal welfare has been a matter for exploration for many years. In contrast, approaches towards improving the welfare and humane treatment of aquatic animals are relatively new, as is the thinking behind them. Several issues complicate the process of addressing the welfare of aquatic animals in a consistent manner. These include the following: - the huge diversity among aquatic ani...

Population growth is affected by several factors such as climate, species interaction and harvesting pressure. However, additional complexity can arise if fishing increases the sensitivity to environmental variability. To predict the effects of fisheries and climate on marine populations, there is a need for improved understanding of how they affect key ecological processes such as population g...

—We used an age-structured model to evaluate the impacts of recreational angling during spawning on populations of largemouth bass Micropterus salmoides and the potential benefits of seasonal fishing closures. We simulated fisheries with average and high capture rates (i.e., fractions of the stock caught by anglers). We manipulated mortality rates to mimic the effects of various regulations, in...

Gillnetting is one of the most practiced fishing methods adopted in the South of Brazil and has been increasingly expanding over the last years. This paper presents the characterization of the activity and discusses its management, in accordance to results from the discussions on the development of regulations on net fisheries in the South Coast Marine Protected Area (APAMLS) in the state of Sã...

The scalloped spiny lobster Panulirus homarus supports numerous traditional diving, trap and trammel net fisheries in the Western Indian Ocean. Commercial catches made in 2003 to 2005 in the Arabian Sea region of Oman (a coastline of ~1100 km, comprising Dhofar and Al-Wusta) were sampled for length and sex composition, and female reproductive condition. On average, lobsters caught in Dhofar wer...

This paper investigates whether the efficiency effect of product market dispersion is a function of the infrastructural and policy environment. We hypothesize that more developed transportation and communication infrastructure and lower government regulation may reduce transaction costs, intensifying the competition associated with a given market structure, and we use data from the recently lib...

Imagine a world where government regulation of gasoline, justified by scarcity of supply, allowed 20% of the gasoline in the U.S. to be used for farming; 20% for manufacturing; 20% for home use; 20% for government; and another 20% held in reserve for future potential government uses. In this world, prices would regulate the use of gasoline within each sector, but consumers would pay vastly diff...

Propelled by a national concern with social justice and health disparities, the notion of cultural competency is being incorporated into both government regulation and professional standards. Although most of the standards that are being developed nationally apply at the institutional level, it is in the clinical setting where the expectation of cultural competency is the most demanding. The re...

This feature explores the operation of individual markets. Patterns of behavior in markets for specific goods and services offer lessons about the determinants and effects of supply and demand, market structure, strategic behavior, and government regulation. Suggestions for future columns and comments on past ones should be sent to James R. Hines Jr., c/o Journal of Economic Perspectives, Depar...

Abstract This paper develops a model based on the concept of Positive Mathematical Programming (PMP) that is useful for ex-ante analyses how policy measures affect commercial fisheries. PMP models are frequently used in agriculture, but rarely analyzing Fisheries often face large set constraints such as effort regulations and catch quotas which some might be binding others not. An econometric a...