Exploitation frequently reduces the mean age of a fish population, particularly where a lack of property rights stimulates producers to ignore the user cost of harvest. The authors demonstrate that harvesting a young fish bears a significant efficiency cost when the multiple benefits accruing to...

High nitrate concentrations have been reported within Canterbury aquifers due to agricultural intensification. Reducing nutrient loadings to groundwater by a reasonable degree is difficult for industry because of the anticipated cost of effective mitigation technologies. A novel alternative is...

Annual recruitment of the New Zealand longfin eel (Anguilla dieffenbachii) has decreased by 75 percent since significant levels of commercial fishing began in the early 1970s. This motivates application of a multiple-cohort bioeconomic model to a New Zealand longfin eel fishery to investigate...

Agricultural systems in the Western Australian wheatbelt are increasingly moving towards specialist crop production due to elevated cereal prices, depressed markets for livestock products, and ongoing labour scarcity. However, the profitability of crop-only farms is threatened by increasing...

Implications of increasing labour cost and development of herbicide resistance for profitable weed management in Philippine rice farming systems are investigated. The study employs RIMPhil (Resistance and Integrated Management in the Philippines), a bioeconomic simulation model developed to...

This study involves the application of a random-effects double-hurdle model to survey data to identify the farm-level factors affecting the adoption and intensity of herbicide use in rice production in the Philippines. Results broadly indicate apparent differences in the degree to which...

Annual recruitment of the NewZealand longfin eel (Anguilla dieffenbachii) hasdecreased by 75 per cent since significant levels of commercial fishing began in the early 1970s. This motivates application of a multiple-cohort bioeconomic model to a New Zealand longfin eel fishery to investigate its...