TOTAL LENGTH (MM.) 

 60 80 20 ao 



100 

 50 



A 



100 

 50 



:ioo 

 I 



' 50 



A 



A^ 



APR 15.1965 

 N'lOO 



APR 22,1965 

 N=lOO 



APR 29. 1965 

 N:Are 



TOTAL LENSTH UN) 



MAY 20, 1965 

 N=826 



MAY 27, 1965 

 N = l055 



JUN 3,1965 

 N:I06S 



JUN 10,1965 

 N--816 



JUN 17.1965 

 N- 762 



10 







Z 

 20 S 



4 



.0" 



°i 



o 



10 ^ 



5 



a 



20 s; 





 

 30 

 20 



Figure 22. — Length-frequency curves for brown shrimp 

 from Swan Lake (Galveston Bay), April 1 through June 

 17, 1965. 



juvenile brown shrimp were present for the 

 following 3 wk., and then the larger group 

 moveci from the lake presumably to Galveston 

 Bay. During this period, the weekly growth 

 increment of each group was about 10 mm. 

 (3/8 in.). Juvenile white shrinnp were caught 

 first on June 10 and dominated catches by 

 June 24. 



To obtain information on species composi- 

 tion, we began preliminary investigations of 

 bait- shrimp fisheries in Aransas Bay and in 

 lower Laguna Madre. Samples of bait- size 

 shrimp are collected each week from these 

 areas, frozen, and forwarded to the Galveston 

 Laboratory. Variation in species composition 

 as revealed by samples from three bay sys- 

 tems is shown in table 8. Bait-shrimp catches 

 from Galveston Bay are predominately white 

 or brown shrimp, whereas those from Aransas 

 Pass and lower Laguna Madre show a high 

 incidence of pink shrinnp. These figures do not 

 necessarily reflect the relative production of 

 the three species of shrimp, however, since 

 each species spends a different proportion 

 of its life in estuarine waters. 



Kenneth N. Baxter, Project Leader 



Table 8. --Species composition (percent) of bait shrimp from the major bay systems along the 



■'■ When percentages do not total 100, the remainder is composed of Trachypeneus species, Xiphope- 

 neus krjjjyeri . Si cyoni a dorsalis , cr Macrobrachium spp. 



27 



