The Company of Biologists

Table 4.

Effects of thiourea, triiodothyronine, or both on tilapia larvae

Larvae	0 p.p.m.	25 p.p.b. T₃	300 p.p.m. TU	25 p.p.b. T₃ + 300 p.p.m. TU
Total length (mm)	11.0±1.1^a	11.0±0.9^a	10.8±0.7^a	10.9±0.6^a
Wet mass (mg)	14.5±4.1^a	14.6±4.9^a	12.4±2.9^a	12.6±1.9^a
Mortality (%)	40	6.7	35.5	56.8
Otolith growth
TC to edge (μm)	156.0±18.8^b	171.7±18.8^a	147.9±10.6^b	156.1±13.5^b
Newly deposited DGI	14.4±1.3^a	15.0±1.0^a	13.8±0.5^a	–
T₃ content (ng g^–1)	1.4±0.4^b	4.8±0.9^a	0.8±0.3^b	–

Larvae	0 p.p.m.	25 p.p.b. T₃	300 p.p.m. TU	25 p.p.b. T₃ + 300 p.p.m. TU
Total length (mm)	11.0±1.1^a	11.0±0.9^a	10.8±0.7^a	10.9±0.6^a
Wet mass (mg)	14.5±4.1^a	14.6±4.9^a	12.4±2.9^a	12.6±1.9^a
Mortality (%)	40	6.7	35.5	56.8
Otolith growth
TC to edge (μm)	156.0±18.8^b	171.7±18.8^a	147.9±10.6^b	156.1±13.5^b
Newly deposited DGI	14.4±1.3^a	15.0±1.0^a	13.8±0.5^a	–
T₃ content (ng g^–1)	1.4±0.4^b	4.8±0.9^a	0.8±0.3^b	–

Fish were immersed in different treatments from 4 to 16 days post-hatching(d.p.h.) and were killed for measurement on 17 d.p.h. Data are shown as means± s.d. (N=13–20). TU, thiourea; T₃,triiodothyronine; TC, tetracycline mark; DGI, daily growth increment. Values with different superscript letters are significantly different(P<0.05)

View Large

This Feature Is Available To Subscribers Only