Lunar Cycle Influences Production of Tilapia (Oreochromis spp) Eggs in an Intensive Outdoor Production System in the Tropics

A robust body of evidence has demonstrated that the lunar cycle plays an important role in the reproduction of fish living in natural environments. However, little is known about the influence of the moon on tilapia reproductive activity in intensive fish farming systems. This study aims to evaluate the influence of the lunar cycle on the reproductive performance of tilapias in an intensive outdoor tropical production system in Latin America. Records of two tilapia strains (Nile tilapia [ Oreochromis niloticus; n = 75] and Red tilapia [ Oreochromis spp.; n = 1335]) reared in concrete tanks in a commercial fish farm were analyzed. Over a 3-year period, 60,136 captures were made in intervals of 12 to 14 days and 6,600 females were manually spawned. The number of females spawned and the volume of eggs collected from each tank ( n = 9) were recorded. Data was analyzed by the general linear model and means were compared by least squares means method. A very slight or no variation was observed when the lunar cycle was split into two halves (crescent and waning). The proportions of females spawned and the volume of eggs per spawned female and per female in the tank varied considerably across the eight periods of the lunar cycle, with greater values in the waning than in the crescent phase. A significantly greater proportion of tilapia spawned and yielded more eggs around the full moon than around the new moon and remaining days of the lunar cycle. The moon cycle affected the reproductive activity of tilapia, which were more reproductively active around the full moon and most of the waning phase.

The Orientation of the Kofun Tombs

The Kofun period of the history of Japan—between the 3rd and the 7th century AD—bears its name from the construction of huge, earth mound tombs called Kofun. Among them, the largest have a keyhole shape and are attributed to the first, semi-legendary emperors. The study of the orientation of ancient tombs is usually a powerful tool to better understand the cognitive aspects of religion and power in ancient societies. This study has never been carried out in Japan due to the very large number of Kofun and to the fact that access to the perimeter is usually forbidden. For these reasons, to investigate Kofun orientations, simple tools of satellite imagery are used here. Our results strongly point to a connection of all Kofun entrance corridors with the arc of the sky where the Sun and the Moon are visible every day of the year; additionally, these show an orientation of the keyhole Kofun to the arc of the rising/shining Sun, the goddess that the Japanese emperors put at the mythical origin of their dynasty.

Abruptly Dogen

In the thirteenth century Dogen brought Zen to Japan. His tradition flourishes there still today and now has taken root across the world. Abruptly Dogen presents some of his pith writings—startling, shifting, funny, spilling out in every direction. They come from all seventy-five chapters of his masterwork, the Eye of Real Dharma (Shōbōgenzō 正法眼藏), and roam through mountains, magic, everyday life, meditation, the nature of mind, and how the Buddha is always speaking from inside our heads. An excerpt from chapter 1, “A Case of Here We Are”: Human wisdom is like a moon roosting in water. No stain on the moon, nor does the water rip. However wide and grand the light, it still finds lodging in a puddle. The full moon, the spilling sky, all roosting in a single dewdrop on a single blade of grass. A man of wisdom is uncut, the way a moon doesn’t pierce water. Wisdom in a man is unobstructed, the way the sky’s full moon is unobstructed in a dewdrop. No doubt about it, the drop’s as deep as the moon is high. How long does this go on? How deep is the water, how high the moon?

How Much Did the Moon Heat Young Earth?

Tidal heating may have raised the surface temperature of early Earth and triggered global volcanism, a new study says.