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1 5 0 4 N. M. K N I P O W I T S C H . fa lls h a u p ts a c h lic h d ie k a lte n G e b ie te , fin d e n s ic h je a o c h a u c h in k a lte r e n T e ile n d e r Z w e ig e d e s G o lfs trom s (m it T e m p e r a ­ tu r e n ttb e r 0 ° ). E in e A r t b ew ohn t. a u s s c h lie s s lic h d a s k a lte G e b ie t des W e is s e n M e e re s . I n zw e i A r t e n k a n n m a n d e u tlic h e V a r ia tio n e n im B a u in Z u s am m e n h a n g m it p h y s ik a lis c h - g e o g r a - p h is c h e n V e r h a ltn is s e n f e s ts te lle n . So b ild e t z. B . Lycocles rossi M a l m g r e n im G e b ie t d e r Z w e ig e d e s G o lfs trom s zw e i v o n d e r ty p is c h e n d e u tlic h a b w e ic h e n d e F o rm e n . N a h e r e s h ie r - iib e r sow ie tib e r d ie A b h a n g ig k e it d ie s e r F is c h e v o n T ie fe n - V e r h a ltn is s e n f in d e t d e r L e s e r in m e in e r A b h a n d lu n g tib e r d ie se F is c h e 1). D e r R e lik te n - S e e ,,M o g iln o je “ a u f d e r I n s e l K ild in (a n d e r M u rm a n -K tis te ) z e ig t s e h r e ig e n th u m lic h e p h y s ik a lis c h - g e o g r a - p h is c h e u n d b io lo g is c h e V e r h a ltn is s e . D e r S e e lie g t am S tr a n d , v om M e e r d u r c h e in e n W a ll g e t r e n n t . D a s m ittle r e N iv e a u d e s S e e s lie g t e tw a s h o lie r a ls d a s m ittle r e N iv e a u d e s a n g r e n z e n - d e n M e e re s , d u r c h d e n W a ll fin d e t e in A u s ta u s c h d e s W a s s e r s d e s S ees u n d d e s M e e re s s t a t t , u n d d ie G e z e ite n g e b e n s ic h a u c h in d em S ee k u n d , w e n n a u c h in s e h r v e r k le in e r te r S k a la (e in ig e Z e n tim e te r a n s ta tt e tw a 4 M e te r ) u n d m it s t a r k e r V e r s p a tu n g . D ie T a b e lle a u f d e r S . 1 3 0 6 u n d d ie F i g . 3 a u f d e r S . 1 3 0 7 g e b e n u n s e in e d e u tlic h e V o r s te llu n g iib e r d ie p h y s ik a lis c h - g e o g r a p h is c h e n V e r h a ltn is s e d e s S ees, u n d zw a r iib e r d ie V e r te ilu n g d e r T e m p e r a tu r , d e s S a lz g e h a lts u n d d es S c hw e fe lw a sse rsto ffs . M a n k a n n h ie r d r e i Z o n e n u n te r s c h e id e n : d ie o b e re b is e tw a 6 m ., in w e lc h e r d ie F a u n a f a s t a u s s c h lie s s ­ lic h a u s S tis sw a s s e rfo rm e n b e s te h t (b e s o n d e rs a u s D a p h n id e n ) , e in e m ittle r e u n g e f a h r v o n 7 b is 1 2 m . m it e in e r m a r in e n F a u n a (u n d F lo r a ) u n d e in e u n te r e , wo m it A u s n a h m e v o n B a k te r ie n k e in L e b e n e x is tie r t. In d e r m i ttle r e n Z o n e k a n n m a n w ie d e r zw e i A b te ilu n g e n u n te rs c h e id e n : in d e r o b e re n *) N. K n ip o w its c h . Ichthyologische Untersuchungen im Europaischen Eismeer. I. Lycocles und Lycenchelys. Memoires de 1’Academ ic Imperiale des Sciences de St. P6tersbourg. 1906.