Fish as food. / Volume 4 by Georg Borgstrom

By Georg Borgstrom

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In w o o d e n boats, insulation is rarely used in t e m p e r a t e waters. O n e reason is t h e good insulating properties of t h e w o o d itself; another, that rot in t h e w o o d m a y easily o c c u r in p l a c e s w h e r e outside air c a n n o t k e e p t h e w o o d dry. S p e c i a l precautions, therefore, must b e t a k e n ( M e s c h k a t , 1951). T h e following tabulation indicates h e a t transfer in a h o l d during s u m m e r m o n t h s c a l c u l a t e d in tons of i c e on a 6-day trip for an unin­ sulated E a s t C a n a d i a n t r a w l e r a n d for t h e s a m e ship provided w i t h 4 inches o f insulation ( D u n n , 1 9 4 6 ) .

I t should b e n o t e d that t h e storage experiments w e r e not carried b e y o n d 3 to 7 days. I n order to speed up t h e handling of fish on d e c k it is a c o m m o n p r a c t i c e , with p e l a g i c fishes such as herring, to use b u n k e r holes on t h e d e c k a n d chutes to m o v e t h e fish rapidly b e l o w deck. O t h e r fish a r e most often c o l l e c t e d first in baskets for gutting a n d c l e a n i n g a n d are then b r o u g h t u n d e r deck. T h i s takes time, a n d t h e trawler d e c k flume 1.

N o benefit was derived from brushing and washing t h e worn boards in w a r m water. M a c C a l l u m draws attention to t h e well-known fact that it is very difficult to k e e p w o o d e n boards well p a i n t e d or varnished a n d h e therefore suggests that m e t a l lining b e m o r e widely used. 2. Metal O n t h e other hand, it is true that aluminum or other light m e t a l alloys h a v e m a n y advantages a n d in r e c e n t years these h a v e b e e n installed in 1. HANDLING O F F R E S H F I S H 27 a n u m b e r of b o a t s ( F i e d l e r , 1 9 5 3 ; Anonymous, 1 9 5 3 a ) .

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