Simulation of optimal harvesting strategies for small-scale mixed-sex tilapia (Oreochromis shiranus Boulenger 1896) ponds using a bio-economic model

A cohort-based bio-economic biomass growth and economic model, validated with data from experiments conducted in Malawi, was used to identify an optimal harvesting strategy for mixed-sex tilapia ponds.Three harvesting scenarios (baseline, economic optimum time +10 days and economic optimum time) were used. In each harvesting scenario four options were explored: (i) no further harvest, harvest every (ii) 60 days, (iii) 90 days and (iv) 120 days after initial harvest.

The capture and culture of postlarval coral reef fish: potential for new artisanal fisheries

This article summarises the reasons why the removal of postlarval coral reef fish should be sustainable and identify those conditions that may require restrictions to fishing for postlarvae. The authors also outline why the capture of wild postlarvae complements initiatives underway to sustain the production of coral reef fish through the cultivation of juveniles reared in hatcheries.

Increasing wild fish harvests by enhancing rice field habitats.

Aside from producing the carbohydrate staple, the rice paddies of Bangladesh are also known as reliable sources of fish. Large quantities of fish enter the flooded paddies during the rainy season, spawn and grow there. In the past, this was possible without any active management as the rice fields were full of indigenous small fish. Today, however, the quantity and diversity of wild species have decreased significantly. If this downtrend continues the fishes in the rice fields and flood plains may completely disappear.

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