December 1973 with a 0.9-m Isaacs-Kidd Midwa- 

 ter Trawl. Stations were located in channel areas 

 where depths ranged from 12 to 26 m, with the 

 exception of station 5 which had a maximum depth 

 of 4.8 m. 



A Coast Guard utility boat (12.3 m long) con- 

 verted for research was used to sample stations 

 during daylight at high tide. The 0.5-m net with 

 0.24-mm mesh was towed for 9 min at each station 

 bottom to surface using a 3-stepped oblique tow (3 

 min at each level). Volume of water strained was 

 estimated by a centrally located TSK 1 flowmeter. 

 The 0.9-m trawl was towed once a month for 15 

 min at station 2 March through December 1973. 

 The trawl was towed in a 3-stepped oblique man- 

 ner (5 min at each level), surface to bottom. 



Samples were preserved immediately on board 

 the vessel with 10% Formalin in seawater. In the 

 laboratory larvae were measured using a dissect- 



1 Reference to trade names does not imply endorsement by the 

 National Marine Fisheries Service, NOAA. 



ing microscope having a micrometer eyepiece. 

 Measurements refer to standard lengths mea- 

 sured from snout tip to notochord tip; after for- 

 mation of the caudal fin, to the end of the hypural 

 plate. Salinities and temperatures were recorded 

 on the bottom and at the surface at each station 

 with a Beckman model RS5-3 induction 

 salinometer. 



Evergreen boughs were provided as spawning 

 substrate January through July. A small trap 

 constructed of hardware cloth was attached to the 

 boughs to capture and identify fishes depositing 

 eggs. The device was operated with a hand winch 

 mounted on a pier near station 3 and examined 

 three times per week. 



Results and Discussion 

 Species Composition 



Larvae, postlarvae, and juvenile fishes from 13 

 families were captured during this investigation 



TABLE 1. — Checklist of larval, post-larval, and juvenile fishes captured with a 0.5-m plankton net and a 0.9-m Isaacs-Kidd 



Midwater Trawl during 1973. 



219 



