TABLE OF CONTENTS Pages Symposium 1 - the National Sea ...

Results and Discussion
Fish Growth and Production
Over the production cycle 398 dead fish were removed (1.1%) and another 553 fish were
culled (1.5%). Over the same period, the culture tank’s fish density increased from 35
kg/m 3 to as much as 148 kg/m 3 , before fish were harvested (Figure 3). Mean fish size
increased from 15 grams on December 16 (1999) to 100 g on March 13 (2000), an
interval of only 88 days. The fish’s specific growth rate was 2.14% of their body weight
per day. During this same period, the fish biomass increased by 2,994 kg (6,586 lb) and
the fish were fed 3,509 kg (7,719 lb) of feed, producing a feed conversion of 1.17.
Fish density, kg/m 3
160
140
120
100
80
60
40
20
0
fish stocked into 2 tanks
Figure 3. Fish densities within the partial-reuse system during the study.
Overall Water Quality and Water Flowrates
fish split into 3 tanks
Mean water quality data recorded during the study is shown in Table 1. Relevant water
flow rates during the study: 1142-1847 L/min total system flow, 237-357 L/min make-up
flow, and 169 L/min total bottom-drain flow. Thus, the bottom drain flow and system
make-up water flow were only, respectively, 12-15% and 19-21% of the total system flow
throughout the study.
5
75 kg of fish harvested
262 kg of fish harvested
382 kg of fish harvested
12/16/99 1/7/00 1/29/00 2/8/00 2/9/00 2/25/00 3/10/00 3/13/00 3/20/00
Date (month/day/year)