It was obtained the optimal rotation time for the polyculture of tilapia
nilótica and white shrimp in freshwater, with a bioeconómic model. Data
for modelling were extracted from an experiment conducted in
CINVESTAV-IPN, unit Mérida, during the summer of 2008. The stocking
densities studied were 32.2 tilapia/m3 and 33.7 and...
The optimal harvesting time in a fish farm is analyzed in the paper. Fish population is assumed to be heterogeneous with respect to weight, so a distributed parameter dynamic model is considered. Theoretical and numerical results are obtained and compared with the ones concerning homogeneous fish cultures only. The results...
The present paper studied system viability of tilapia nilotica and Australian redclaw crayfish in
polyculture, considering tialpia as main species. Three scenarios were analyzed: tilapia monoculture with
38.7 fish/m3 and tilapia and Australian redclaw polyculture, considering the same stocking density for
fish in monoculture and 17.5 crustaceans/m2, of which one...
This study explores the optimal harvesting time in a size-heterogeneous population dynamics. The model includes the effect of population density in both the mortality rate and individual growth. An application to specific conditions of shrimp culture in Mexico is presented. The optimal harvesting rule is numerically found for different economic...
Nile tilapia has been cultivated in intensive systems in Yucatan, Mexico, during the first years of this century. Nevertheless, its adoption faces technical (related to the use of commercial feed) and marketing problems (fixed price of $2.14/Kg), which are analyzed in this paper. To do this, a bioeconomic model of...
Tilapia culture in Yucatan State, Mexico, is largely semi-intensive. The producers are mostly poor farmers who receive government subsidies for purchase of fingerlings and balanced feed. Feeding practices are often inadequate (satiety rations), moreover, producers frequently suffer financial and resource shortfalls. During feed shortages producers are known to use empirical...
Balanced feed represents approximately 60 % of production costs in fish culture and ration size has significant effects on this parameter. Ration size varies according to culture strategies and producer knowledge. It can also have environmental implications since feed can be a pollutant. A bioeconomic model was developed for an...