Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 284 MARINE ANIMALS mina maritima and further in the northeast a large number of rotifers. The salt content of seems to set limits which even euryhaline sea animals pass with difficulty; only the barnacle Balanus improvisus and the bryozoan Membranipora pilosa extend beyond it. Fig. 76.—Map of the Baltic Sea. The salt content per thousand in vertical figures, the depth in meters in oblique figures.

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Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 284 MARINE ANIMALS mina maritima and further in the northeast a large number of rotifers. The salt content of seems to set limits which even euryhaline sea animals pass with difficulty; only the barnacle Balanus improvisus and the bryozoan Membranipora pilosa extend beyond it. Fig. 76.—Map of the Baltic Sea. The salt content per thousand in vertical figures, the depth in meters in oblique figures. After Brandt. Many immigrants from the North Sea are not able to propagate in the Baltic and restore their numbers only by means of ever-renewing reinforcements, , the copepod Paracalanus Of 11 species of marine fishes, which are common to the Gulf of Finland and the North Sea, 9 are here unfertile; only the sprat (Clupea sprattus) and

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