Development Times 



Diets supplying A r^em JO nauplii in stage I re- 

 sulted in highest survival to stage II and the 

 shortest development times (Table 3). Of the four 

 diets grouped in the first subset (Table 4) for the 

 molt into stage II, diet ABDE was the best. Diets 

 BD and BD/ABD, although identical in content 

 during stage I, were significantly different. 



For the molt from zoeal stage II into megalopae 

 diet ABDE again resulted in the shortest de- 

 velopment time. Grouped with ABDE in 

 homogeneous subset I was A2, with the latter diet 

 sufficiently similar in molt time to diet Aj to also 

 be included in subset II. As in the first molt, diet 

 BD/ABD had the longest time to molt. 



Table 3. — Development times of Libinia emarginata larvae 

 from hatching to each molt for each diet. Diets EED, D, and S did 

 not allow development past stage I. 



Molt 



Diet 



I- 



l-^M 



I -►J 



A, 



ABD 



BD/ABD 



ABDE 



BD 



X 



SD 



Range 



X 



SD 

 Range 



X 



SD 

 Range 



X 



SD 

 Range 



X 



SD 

 Range 



X 



SD 

 Range 



4,66 



060 



4-7 



4.42 



050 



4-5 



462 



0,64 



4-6 



6,56 



1,36 



5-9 



4.25 



0,44 



4-5 



572 



1,28 



4-8 



1029 

 1,14 

 9-14 

 987 

 0.51 

 9-11 



10.30 

 0.85 

 9-12 



13.00 

 1.73 



11-14 

 9.39 

 0.50 

 9-10 



18.86 



2.48 

 16-22 

 1867 



3,79 

 16-23 

 19,00 



2,21 

 16-24 

 21,67 



306 

 19-25 



FISHERY BULLETIN: VOL. 76. NO. 1 



In the last molt, from megalopae to the first crab 

 stage, all four diets tested were grouped as one 

 subset. Of the four, Aj was ranked as the best in 

 terms of development times and BD/ABD was the 

 worst. 



Carapace Measurements 



Spine height, carapace length, and carapace 

 width measurements were analyzed by a Scheffe 

 posterior comparison test (Table 5). Zoeal stage II 

 and juvenile crab measurements were not sig- 

 nificantly (P = 0.05 level) different and were 

 grouped into one homogeneous subset; carapace 

 lengths of megalopae were similar in all diets. 

 Only the carapace widths of megalopae proved 

 statistically different, with two subsets describing 

 the measurements of the larvae reared on differ- 

 ent diets. 



Ranking within each subset provides an indica- 

 tion of possible trends in size with respect to the 

 diets tested. This trend is most evident in zoeal 

 stage II; in both spine height and carapace length 

 the ordering of diets was identical, with A2 

 superior and ABD second. In megalopae and 



Table 4. — Homogeneous subsets of diets tested on Libinia 

 emarginata larvae as determined by analysis of variance and 

 Scheffe posterior comparisons (P< 0.05) of development times. 

 Shortest times are listed in subset I and longest in subset III. 



Subset 



Stage I -HI 



ll-^M 



M-^J 



ABDE. A2. ABD, A, 



BD 



BD/ABD 



ABDE, A 2 



A2, A,, ABD 



BD/ABD 



A,, A2. ABD, BD/ABD 



Table 5. — Carapace measurements for stage II, megalopa, and juvenile Libinia emarginata 

 reared on various diets. Mean values (in millimeters) of spine height (SH), carapace width (CW), 

 and carapace length (CL) are given in ranked order within each homogeneous subset of similar 

 values. Roman numerals followdng the diet symbol denote replicate number, if applicable. Diets not 

 represented, e.g., A, in stage II, could not be analyzed because of insufficient data. 



Larval 

 stage 



Parameter 

 measured Subset 



Ranked order of means 



Zoea II 



Megalopa 



Juvenile 



62 



