Fish cultivation

Two-Species Fish Cultivation Policy with Price and Biomass Dependent Catch Rate

For the first time, a cultivation policy of two living species is outlined via an evolutionary method when their demands are price and biomass dependent. Here, the species ameliorates and deteriorates with time and are of the type of prey – predator. Predator species do have some natural growth in addition to their growth depending on other species. The species are cultivated for one period onl...

Can the co-cultivation of rice and fish help sustain rice production?

Because rice feeds half of the world's population, a secure global food supply depends on sustainable rice production. Here we test whether the co-cultivation of rice and fish into one "rice-fish system" (RFS; fish refers to aquatic animals in this article) could help sustain rice production. We examined intensive and traditional RFSs that have been widely practiced in China. We found that rice...

Cultivation Techniques

The Extension of Cultivation

Ricardo after Sraffa In the preface of the Principles (1817), Ricardo states that the main problem of Political Economy concerns the distribution of income among the three classes of society: the capitalists, the workers and the landowners, who receive the profits, the wages and the rents, respectively. When rent is discarded, the trade-off between wages and profits becomes apparent. Nowadays, ...

Cultivation of Vaccine Virus

1. A strain of neurovaccine virus was cultivated in a medium consisting of minced chick embryo suspended in Tyrode's solution. 2. The virus upon cultivation apparently lost none of its essential characteristics. 3. The culture virus can be preserved and stored for long periods of time. Furthermore, the preserved virus can be used to initiate fresh cultures.