distinct bimodal size distribution. Most are spherical or almost spherical. What are the theories explaining the mystery? ★ A Maori Legend: The boulders are remains of calabash (a gourd bearing tree), kumara (a sweet potato) and eel baskets which washed ashore when a canoe was shipwrecked. The rocky shoals which extend seaward from nearby Shag Point are the canoe’s petrified hull. Theories ★ Aliens: Conspiracy theorists tell us the Moeraki Boulders are alien eggs either sent from space or washed up by the ocean. ★ Volcano: A plausible explanation, they were shot out of an ancient volcano and this is where they landed. My theory ★ I think that Moeraki Boulders are result of ice melting or volcano, but
The country has 3974 km of coastline, while the land border, in comparison, is only a mere 633 km. The coast varies from limestone cliff in the north to sandy beaches in the west. Most of Estonia's many islands belong to the West Estonian archipelago. The largest islands are Saaremaa with 2671 sq km, Hiiumaa with 989 sq km and Muhu with 200 sq km. The sea between these islands and the Mainland Väinameri is very shallow (less than five metres deep on average) and rich in shoals. The water of the Baltic Sea is brackish. Its average saltinity is only one fourth of that of the sea in general. Thus, most Estonian freshwater fish (about 30 species) also inhabit the sea. There are some 1450 lakes in Estonia (6.1% of its territory). The two largest of them are Lake Peipsi (the fifth largest in Europe) at 3555 sq km and Võrtsjärv with its 270 sq km area. About 1440 vascular plant species grow in Estonia, while ¾ of the total number of species are
well as in some lakes. No impact on bottom habitats and bottom structures. 90Incidental catch of In most cases it is a single species fishery, bycatch rates of other species are low. dolphinsand marine mammals may occur in some areas. Midwater pair trawling can be effective in different situations: when fish are aggregated into large dense shoals and when (at another season or time of the day or according to physiological status) fishes are regularly distributed within a given water layer. In addition to the difference it makes whether the fish are aggregated in a small volume or spread within a large one, fish may swim (and avoid the net) at different speeds according to its own physiological status and/or other external conditions. As a result, in addition to the fish which is targeted, other different conditions will affect
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