61°N ^50°^ 



146°W 



142°W 



FISHERY BULLETIN: VOL. 79, NO. 2 



138°W 



59ON 



57ON 



55ON 



53°N 



Giacominj 

 1683-692 m) 



€> 



Quinn 

 1732-812 ml 



Pratt 

 |796-799m| 



Patton 

 1384-673m| 



Surveyor 

 1602-705 ml 



(J 



Durgin 

 |705m| 



Welker 

 |778-796m] 



Dickjns 

 |476m| 



9 



Figure l. — Location of the eight seamounts which were surveyed on a 1979 NMFS cruise to the Gulf of 

 Alaska. The range of sampling depths on each seamount is indicated. 



with intervening sediments. This physiography 

 limited sampling to the seamount tops. Sampling 

 depths ranged from 384 m on the Patton Sea- 

 mount to 850 m on the Quinn Seamount. 



The carapace lengths of all crabs and the right 

 chela heights of males were measured to the 

 nearest 0.1 mm using vernier calipers (see Wallace 

 et al. (1949) for a description of these two measure- 

 ments). The reproductive condition of females was 

 scored according to the following six-point scale: 



1) Immature — white undeveloped ovaries and 

 no egg remnants on the pleopod bristles. 



2) Virgin — orange developed ovaries and no 

 egg remnants on the pleopod bristles. 



3) New eggs — orange external eggs with no 

 evidence of embryonic eyes. 



4) Developing eggs — tan external eggs with 

 obvious dark embryonic eyes. 



5) Hatching eggs — partial clutch of well- 

 developed eggs, with remnants of hatched 



eggs attached to pleopod bristles and occa- 

 sionally with prezoea on the egg mass. 

 6) Completely hatched — no external eggs, but 

 remnants of eggs, especially the egg funiculi, 

 attached to the pleopod bristles. 



Abdomens, complete with attached eggs, were 

 removed from a selected number of females and 

 preserved in buffered lO^r Formalin. In the labo- 

 ratory, the pleopods from females with new and 

 developing eggs were removed and dried. After 

 freeing the eggs from the pleopods, the total clutch 

 was weighed and a subsample was weighed and 

 counted. Total egg number was calculated by 

 dividing total clutch weight by the average egg 

 weight of the subsample. Maximum egg length 

 was measured to 0.1 mm using an ocular microm- 

 eter. Measured eggs were well developed and 



Reference to trade names does not imply endorsement by the 

 National Marine Fisheries Service, NOAA. 



260 



