October 1966 



COMMERCIAL FISHERIES REVIEW 



23 



Fig. 4 - A view looking north at the Cultivation Experiment 1 

 tract on Long Island State Oyster Reserve in southern Willapa 

 Bay, Wash. (Photo by C. S. Sayce) 



oyster shell, appeared to be more firm in the 

 area where Pacific oysters were concentrated. 

 The oysters were old (5+ years), clustered, 

 and partially buried. The tract was laid out 

 in four rectangular lanes 65 by 200 feet with 

 the length running parallel to the reserve line 

 from monument 68 to 69 in a northwest -south- 

 east direction. The plots were designated 

 control lane, lane 1, lane 2, and lane 3 (fig. 5), 

 and surveys of each lane were made before, 

 during, and after dragging. About 25 percent 

 of the area had an eel grass cover; the growth 

 was heaviest in the control lane and lane 3. 



Fig. S - Arrangement of lanes for Cultivation Experiment 1, 



Table 1 

 PerSq 



- Mean Number of Live Oysters, Loose Shells, and Clusters 

 uare Yard for All Lanes of Cultivation Experiment 1 



Date 



Lane 



Square 



Yard 



Sampled 



Mean Live 



Oysters 

 PerYard2 



Mean Number 

 of Shells 

 Per Yard2 



Mean Nxunber 

 of Clusters 

 Per Yard2 



1964 

 July 23 



1 

 2 



3 



22 

 22 

 19 



19.3 



12.8 



8.2 



15.4 



9.3 



12.2 



3.0 

 3.9 

 1.0 



Ausust 7 



Control 



21 



14.9 



24.8 



2.5 



Auqust 6 



2 



24 



18.2 



19.0 



3.0 



October 3 



1 

 2 

 3 



4 

 6 



3 



21.5 

 12.3 

 51.0 



12.2 

 13.0 

 43.0 



4.2 

 0.8 

 8.7 



1965 

 March 13 



1 



2 



3 



Control 



10 

 10 

 10 

 10 



9.1 



17.6 



7.8 



8.4 



34.3 

 24.2 

 13.0 

 22.2 



2.5 

 1.2 

 0.2 

 2.4 



Fig. 6 - The square -yard sampler used for making a systematic 

 count of live and dead oystere, amount of shell, and ntunber 

 of clusters. The line of cedar stakes indicates locations to be 

 surveyed. (Photo by C. C. Larson) 



A square -yard frame was used to sample 

 areas at regular intervals along a diagonal line 

 bisecting e^ch lane. Within the square-yard 

 sample area, all live and dead oysters, number 

 of clusters, oysters per cluster, and loose (single) shells were counted (fig. 6, table 1). Gaping 

 oysters were counted as dead, and special note was made of dead oysters which had broken 

 or punctured shells (fig. 7). Records of temperature, salinity, and turbidity of the water 

 were tabulated during the experiment and counts of oyster larvae were taken in the overlying 

 waters during the spawning and setting season. Following completion of dragging and after 

 the spatfall, shell samples from each lane were checked to determine the effect of dragging 

 upon the setting of Pacific oysters. The experiment began with a predragging survey of all 

 lanes. 



