Biloxl, IliGaicclppi, to U32.6 tono for a vecsel \d.th a 37 -ton hold 

 capacity oporating out of Broimevllle, Texao. Concur^ption vaa lo-^?c;st 

 durln3 tlio January-April period and vas highast during the montha of 

 May through August. Ice concuiption of Biloxi, lliGDisoiijpi, veccels which 

 rani^ed frcin 6.h to 7t9 pounds of ice per pound of ahritjp vas lowest daring 

 the cuisner months, in terns of pounds of shriJip caught, because of the 

 loree quantity of shriiirp landed then. In the oi_ue period Key West, 

 Florida, vessels and vessels operating out of T^xas i>ortQ used from 10. 5 

 to l3eO pounds of ice per pound of ehriiaji caught. Variations in consump- 

 tion bot^reen individual vessels are shown in table IV-14-5* 



Vessels with insulated holds are substantially more economical 

 in their consumption of ice than uninsulated vessels. (s2e table IV - k$) 

 A preference ^?as expressed by scce vessel owners for focm plastic as 

 insulating material. On the basis of their observations Horu-ell, Knowles 

 and Associates Ends the following reccniinendQtions with respect to icing 

 and insulating methods: 



(1) Avoid insulating material that is likely to crumble and 

 form voids when adjacent to ribs, 



(2) Reduce vapor and condJictivity by putting two layers of 

 30-pound asphalted felt on hull and bulwarks . 



(3) Seems formed by Insulating material slabs should overlap 

 to avoid air gaps. 



(U) The slabs should be secured to each other \rith an adhe- 

 sive such as hot tar, or other suitable ccupound, rather than by nails 

 driven into the hull planlcing. 



(5) It is important that a proper balance be struck bett/aen 

 the need for reduced temperature and the need for the bathing of the 

 Bhrlup in vater from the malting ice. Too heavily Insulated holds will 

 precarve the catch but ^rill result in the forijation of "black spot" on 

 the shrinifp shell since adequate water film will not form to protect the 

 shrimp agaiuat access to oz^gen. Tliree-inch insulation of the hull and 

 four- inch of tlie dock and engine roca bulkhead appears to cpproximate 

 this balance. An additional Inch is recoaHiended for steel hulled vessels. 



(6) An alternate and perhaps better method of insulation can 

 be etiployed. The insulation in bins can be increased so as to reduce 

 melta^s of ui-jusad stoclcs of frech ice to a mlniraui and provide a vent 

 to let a controlled Eiiiount of vcjcn air into bins vhave shrinp are 

 already iced. This trill psitilt proper bathing of the ehriEp and at the 

 63ie tliiia conserve ice not in use. 



Recently, antibiotic ices have been developed which extend 

 the keeping life of shritip foxir to eix days (Ccuber, 1955). The 

 application of such ices to ccciiaercial catches, however, is still 

 barred by Federal Law, 



212 



