This document is part of a series of 5 technical manuals produced by the Challenge Program Project CP34 “Improved fisheries productivity and management in tropical reservoirs”. The Water Research Institute (WRI) in Akosombo, Ghana, is working to bring cage aquaculture technology to smallholder farmers. The stocking, feeding and cage-construction technology piloted by WRI is now being widely adopted in the Lower Volta basin in Ghana. The results of WRI research over the period 2005-2009 are presented here as a guide to potential investors.
This paper presents a comparative analysis of the technical and economic parameters of two community led approaches: the semi-closed water bodies and the floodplain water bodies based systems in Bangladesh. The two approaches differ in management, fish production, impact on biodiversity, capital investment and annual variable costs, share of profits and proportional benefits for the poor, and impact on allied businesses—the so-called backward and forward linkages.
This poster outlines the key steps in setting up a fish pond for tilapia farming in Solomon Islands, from making the pond to harvesting.
The purpose of the project was to increase fish production, household nutrition, income and alternative employment opportunities of vulnerable Adivasi (tribal) people through promotion of small-scale aquaculture and enterprise related activities. The AFP is designed to bring the unused and/or underused seasonal ponds and rice fields into improved productive capacities with methods that are feasible, affordable and acceptable to poor Adivasi households.
Three typical African partial harvesting systems and an unfished control were compared for gross yield. Fish grew undisturbed on an input regime based on that used by Malawian smallholding farmers for 122 days. Then, for an additional 143 days, ponds were partially harvested once per week by hook and line, seining with a reed fence or basket trapping. Hook and line fishing and seining with a reed fence partially harvested a significantly (P0.05) greater weight of fish than did trapping. Gross yield was significantly (P0.05) higher in ponds partially harvested by hook and line.
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.
An account is given of gleaning activities conducted by the women in the reef flats of Bolinao and Anda, northwest Lingayen Gulf, in the Philippines in order to supplement the dwindling fishing catches of their menfolk and also to provide food for their families.
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.
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.