THE U. S. FISHERIES STEAMER ALBATROSS. 9 



Lobster pots. — Three lobster pots were set out twice over night for periods of 12 and 11 

 hours, respectively. 



Gill nets. — Two small gill nets, such as are used for herring, were set on one occasion and 

 left out over night for 1 1 hours. 



Series of water densities, by means of the Sigsbee bottles, and subsurface temperatures, 

 by the usual self-registering Negretti and Zambra thermometers, were taken at 3 sta- 

 tions, as follows: From 800 fathoms to 50 fathoms, 1 series; from 1,000 fathoms to surface, 

 2 series. 



In Monterey Bay apparatus was employed as follows : 



Tanner beam trawl, 16-foot. — At 10 stations was dragged an average of 20 minutes each 

 time and a distance of 0.8 mile. 



Tanner beam trawl, 11-foot. — Except one station where it fouled in less than 5 minutes, 

 15 hauls were made of an average duration of 27 minutes each and an average distance of 1 

 mile. 



Tanner beam traid, 9-foot. — Leaving out one station of less than 5 minutes, there were 8 

 hauls of this apparatus, averaging 27 minutes and 0.8 mile. 



Tanner beam trawl, 8 foot. — Hauled at 25 stations an average of 22 minutes for a distance 

 of 0.8 mile on the average. 



Blake beam trawl, 10-foot. — Made 46 hauls, averaging 20 minutes time, and 0.6 mile over 

 the ground. 



Albatross-Blake beam trawl, S-foot. — Used at 7 stations an average of 23 minutes each 

 and dragged an average distance of 0.75 mile. 



Tangle swabs, 8 on frame. — Hauled 8 times, an average of 13 minutes each, an average 

 distance of 0.5 mile over the bottom. 



Tangle swabs, 6 on frame. — Eight hauls, averaging 17 minutes, and 0.6 mile each. 



Tangle swabs, 2 on frame. — Used with trawl nets 6 times, an average of 17 minutes each, 

 an average distance of 0.66 mile. 



Tangle swab, single. — Used with trawl nets 5 times; average time, 17 minutes; average 

 distance dragged, 0.5 mile. 



Boat dredge. — Used as an auxiliary to hauls of tangle swabs twice, an average, of 14 

 minutes each, for 0.6 mile. 



Mud bag. — Used 20 times as an auxiliary to other apparatus — 7 times with the beam 

 trawls and 13 times with tangle swabs. The average time towed was 20 minutes and 

 average distance 0.7 mile. 



Mud can. — This was an ordinary 1-gallon galvanized pail, which was seized to the tail of a 

 trawl net for the purpose of securing a specimen of the bottom. It was used at 6 stations. 



Open plankton' nets. — Used vertically in 15 hauls, depths 100 to 300 fathoms. This 

 work was all done at 5 stations, three different nets being hoisted simultaneously on 

 the same line. 



These nets were towed at the surface at 8 stations, 13 hauls being made of an average 

 duration of 11 minutes and an average distance of 0.4 mile. One haul was inside a surface 

 net. 



Surface tow net. — Used at 11 stations, 13 hauls being made; average duration, 17 minutes; 

 average distance towed, 0.5 mile. At one trial a Kofoid pattern open plankton net was 

 rigged inside the surface net. 



Wing nets. — These were small, conical nets, hung to light rings of varying diameters, 

 seized to the frames of beam trawls for the capture of small forms close to the bottom. 

 The bags of the nets were of bolting cloth or silk gauze. One was used at 2 stations and 2 

 were used at 17 stations. 



The depth of a bottom haul is indicated in these tables by the several soundings necessary 

 to show the range in depth. When but a single sounding is given ii may be assumed that 

 the depth was regular. Where a depth is "estimated" the angle and scope of the dredging 

 cable is used for this determination. 



