Table 2. — Egg and oil globule diameters (millimeters) as reported in the literature for species which might be 

 confused with Etropus microstomus eggs. References represent only a portion of those available. Recent literature 

 summaries may be found in Hardy (1978) and Martin and Drewry 1 1978). 



Species 



E99 



Oil 



Source 



Enchelyopus cimbnus 

 Urophycis chuss 



Urophycis regius 

 Pepntus tnacdnthus 



065075 



740 89 (X = 82) 

 72-0 76 (X = 74) 

 0.62-0 97 (X = 76) 

 67-0 81 (X = 73) 

 69-0 80 (X = 75) 

 75-0 79 (X =0 77) 



13-0 15 



13-0,20 (i » 16) 

 0.15-0 17 



0.15-0.22 (X = 0,19) 



0,14-0,22 (X = 018) 



14-0 22 (X = 18) 



17-0 21 (X = 20) 



Battle (1929) 

 Colton and Marak' 

 Bigelow and Welsh (1925) 

 Colton and Maral<' 

 Barans and Barans (1972) 

 Wheatland (1956) 

 Colton and Honey (1963) 



'Colton. J B.Jr.andR R Marak 1969 Guidefondentificationotthecommonplanklonicfisheggsandlarvaeof continental shelfwaters. 

 Cape Sable to Block Island Bur Commer Fish Lab Rel 69-9. Woods Hole Biol Lab . 43 p. 



globule diameter reported for the other species. 

 Once pigmentation appears on the embryo, dis- 

 tinction is greatly facilitated. Enchelyopus cim- 

 brius and Urophycis spp. are easily separated by 

 their heavier and more numerous melanophores. 

 Heavy mealonophores are always scattered on the 

 yolk and oil globule of Urophycis spp. while E. 

 cimbrius have pigmented oil globules and occa- 

 sionally pigmented yolk. Peprilus triacanthus are 

 somewhat more difficult to separate because, like 

 Etropus microstomus they have fine melanophores 

 located on the dorsum. However, this pigment 

 generally forms two distinct rows from the eyes to 

 the tail in P. triacanthus and does not migrate into 

 the finfold as it does in E. microstomus. 



Eggs of Gulfstream flounder, Citharichthys 

 arctifrons, may resemble E. microstomus eggs 

 since the early larvae are quite similar (Richard- 

 son and Joseph 1973). Diameters of unfertilized 

 eggs given by Richardson and Joseph ranged from 

 0.70 to 0.82 mm (x = 0.74) which is considerably 

 larger than E. microstomus. Presumably water 

 hardening would increase this diameter even 

 further. 



Acknowledgments 



We are grateful to Masahiro Dojiri for the illus- 

 trations. 



Literature Cited 



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Bara.njs, C. a., and a. C. Barans. 



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Michael D. Scherer 

 Donald W. Bourne 



Marine Research. Inc. 



141 Falmouth Heights Roatl 



Falmouth. MA 02.^40 



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