329
(17.6)
Models that fit plots of the weight–age relationship (Fig. 17.6) from hatching to
60 days of age (early phase) and from 60 to 176 days of age (ongrowing phase) are:
(17.7)
(17.8)
In open seawater systems at 28 °C, mating occurs at about 90 days of age and spawning
is 1–3 weeks later, at about 110 days of age. The average life span of cultured batches
is about 130–140 days, or within 1 month after spawning. The final size of cultured
squid is about 250 mm in length and 600 g in weight (Nabhitabhata 1978, 1983, 1996;
Nabhitabhata and Kbinrum 1981; SEAFDEC 1975; Tables 17.1 and 17.2).
Alternative Culture Facilities
Ongrowing in net cages that float in natural waters is another option for S� lessoniana
culture. Nabhitabhata et al. (1984) suggested that the most appropriate structure
was a box-type cage, hanging from a floating buoy or a bamboo raft with sinkers
ML 14.083 ln T 51.969
=
−
W
168
8 9T
= 0
0 0 0
.
.
e
W 323.269 ln T 1,323.085
=
−
Fig. 17.6  Growth in terms of the relationship between weight (g) and age (d) in an open seawater
system. Arrows indicate mating (  m) and spawning (  s). (From Nabhitabhata 2002)
17 Sepioteuthis lessoniana