ABSTRACT 

 Fresh yelloweye snapper (Lutjanus vivanus) which had 

 been scaled and eviscerated were treated with the chemi- 

 cals 3,3-thiodipropionic acid, glutathione, disodium eth- 

 ylenediaminetetraacetate dihydrate in combination with 

 propyl gallate, and monotertiary butylhydroquinone. The 

 inhibitory effects that these chemicals had on flesh 

 browning (Maillard reaction) were studied over a 

 12-month frozen storage period. Also, the effects of vac- 

 uum packaging on snapper skin discoloration were 

 studied. 



645. Published in 1971. 



646. Published in 1971. 



647. Revised annotated list of parasites from sea 

 mammals caught off the west coast of North 

 America, by L. Margolis and M.D. Dailey. 

 March 1972, iii + 23 pp. Price 35 cents. 



ABSTRACT 



Parasite-host and host-parasite lists, with supporting 

 references, of the ecto- and endoparasites recorded from 

 marine mammals of the North American west coast are 

 provided. Excluding records in which the parasites have 

 not been identified to the species level, there are known 

 15 trematodes, 3 cestodes, 10 nematodes, 7 acan- 

 thocephalans, 1 copepod, and 10 amphipods from 22 

 species of Cetacea; 8 trematodes, 10 cestodes, 12 

 nematodes, 8 acanthocephalans, 5 anoplurans, and 5 

 acarines from 8 species of Pinnipedia; and 4 trematodes, 

 2 cestodes, 1 nematode, 3 acanthocephalans. and 1 

 acarine from a single species of Carnivora. 



Previously unpublished records which are included 

 here are: Anisakis simplex from Phocoenoides dalli and 

 Orcinus orca, British Columbia; Cyamus balaenopterae 

 from Balaenoptera musculus, California; Cyamus er- 

 raticus from Balaena glacialis, Alaska; Cyamus scam- 

 moni from Eschrichtius gibbosus, Alaska; 

 Antarctophthirus trichechi from Odobenus rosmarus. 

 Alaska. 



648. Published in 1 97 1. 



649. Distribution of forage of skipjack tuna 

 (Euthynnus pelamis) in the eastern tropical 

 Pacific, by Maurice Blackburn and R. Michael 

 Laurs. January 1 972, iii + 16 pp., 7 figs., 3 tables. 

 Price 30 cents, stock number 0320-0036. 



ABSTRACT 

 The fishery for skipjack tuna (Euthynnus pelamis) in the 

 eastern PacificOcean might beextended if offshore areas 

 of high skipjack abundance were known. One would ex- 

 pect the numbers of skipjack in these offshore areas to be 

 related to the distribution of known skipjack forage or- 

 ganisms in the micronekton. The EASTROPAC oceano- 

 graphic cruises yielded net-caught micronekton samples 

 over large parts of the eastern tropical Pacific during 

 seven successive 2-month periods. From these samples. 



the occurrence of organisms known to be prey of skip- 

 jack was expressed as ml/100 m 3 . Charts of night and day 

 concentrations in the upper 200 m were produced for 

 each of the seven periods. 



In the region from long 92° to 1 19 W the major areas of 

 maximum concentration of potential skipjack forage re- 

 mained essentially constant during most periods. Two of 

 these areas lie parallel to the equatorial upwelling 

 zone — one just to the north, the other just to the south. 

 Another zonal area of abundant forage generally occurs 

 between lat 6 and 14° N. Forage is also frequently abun- 

 dant between lat 1 4° and 20° N and long 107 : and 119°W. 



The concentrations of skipjack forage in these areas 

 are comparable with those in nearshore parts of the east- 

 ern tropical Pacific, where the present skipjack fishery 

 occurs. The abundance of skipjack in the forage-rich 

 offshore areas might therefore be sufficient to support 

 commercial fishing operations. Sea-surface tempera- 

 tures are generally suitable for skipjack in those areas. On 

 three recent crossings of the equatorial region at about 

 long 119°W, skipjack appeared to be abundant in the first 

 three areas of high forage concentration mentioned 

 above. 



650. Effects of some antioxidants and EDTA on the 

 development of rancidity in Spanish mackerel 

 (S comber vmorus maculatus) during frozen stor- 

 age, by Robert N. Farragut. February 1972, iv + 

 12 pp., 6 figs., 12 tables. Price 25 cents, stock 

 number 0320-0032. 



ABSTRACT 

 Spanish mackerel (Scomberomorus maculatus) were 

 treated with antioxidant solutions containing BHA and 

 BHT (Tenox 4); BHA, BHT, PG, citric acid, and propylene 

 glycol (Tenox 6); Tenox 4 plus EDTA; Tenox 6 plus EDTA; 

 Ca(Na) 2 EDTA; (Na) 2 EDTA; (Ca) 2 EDTA; and (Na)4EDTA 

 both by dipping and injecting methods. Samples 

 analyzed at 3-month intervals showed fillets packed in 

 vacuum and treated with EDTA remained in good condi- 

 tion over the 12-month storage period. However, samples 

 treated with (Na)4EDTA remained superior to other sam- 

 ples throughout the storage period. 



65 1. The effect of premortem stress, holding tem- 

 peratures, and freezing on the biochemistry and 

 quality of skipjack tuna, by Ladell Craw lord. 

 April I972. iii + 23 pp.. 3 figs.. 4 tables. Price 35 

 cents. 



ABSTRACT 

 This experiment was designed to determine if there 

 were differences (biochemical and/or organoleptic) be- 

 fore and after canning rested and stressed skipjack tuna. 

 The live fish were captured off Oahu and were placed in 

 shoreside tanks in Honolulu, Hawaii. After having been 

 under observation for 24 hr, the fish were sacrificed in a 

 rested or stressed condition. Stress was induced by forc- 

 ing fish to swim around a tank until they showed signs of 

 exhaustion. The rested fish were kept in a separate tank 

 and were agitated as little as possible before being sac- 

 rificed. 



