Effect of stocking density on the growth and survival of the ornamental fish <i>Laetacara dorsigera</i>

Cascais, Brendow Matheus Koide; Costa, Tiago Viana da; Machado, Noédson de Jesus Beltrão; Almeida, João Pedro Cidade; Costa, Raí Vasconcelos; Caldeira, Jamilly Barroso

doi:10.20950/1678-2305/bip.2024.51.e863

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Scientific Article • Bol. Inst. Pesca 51 • 2025 • https://doi.org/10.20950/1678-2305/bip.2024.51.e863 linkcopy

Effect of stocking density on the growth and survival of the ornamental fish Laetacara dorsigera

Efeito da densidade de estocagem sobre o crescimento e a sobrevivência do peixe ornamental Laetacara dorsigera

Authorship SCIMAGO INSTITUTIONS RANKINGS

Laetacara dorsigera is a fish species that has excellent economic potential for ornamental fish farming. The present study aimed to evaluate the effect of stocking density on its growth and survival in two experiments, with three treatments and four replicates, lasting 45 days each. The first experiment used 0.25, 0.50 and 0.75 fish·L^-1, and the second used the best density found in the first experiment and the densities of 0.30 and 0.40 fish·L^-1. The measured zootechnical parameters were survival rate, mean total length and final weights, as well as relative and specific growth, and weight gain rates. A difference was observed in the first experiment for the final length, relative and specific growth rate and survival. In the second experiment, there was no difference for the densities tested. The density of 0.50 fish·L^-1 was the most viable, due to the greater final survival achieved and no significant difference for the other parameters analyzed.

Keywords
Aquarium; Native fish; Ornamental aquaculture; Zootechnical indices

Experiments	Densities (fish�L^-1)	Dissolved oxygen (mg�L^-1)	Temperature (°C)	pH	Ammonia (mg�L^-1)	Nitrite (mg�L^-1)
1	0.25	6.22 ± 0.27	28.08 ± 0.24	7.14 ± 0.10	0.75 ± 0.77	0.98 ± 0.07^b
	0.50	6.27 ± 0.32	28.04 ± 0.18	7.02 ± 0.12	0.48 ± 0.16	1.54 ± 0.25^a
	0.75	6.33 ± 0.23	28.06 ± 0.17	6.94 ± 0.08	0.77 ± 0.19	1.39 ± 0.15^ab
2	0.30	6.29 ± 0.29	28.29 ± 0.19	7.14 ± 0.22	0.60 ± 0.05	1.03 ± 0.06^b
	0.40	6.21 ± 0.08	29.02 ± 1.53	7.06 ± 0.03	0.45 ± 0.08	1.65 ± 0.26^a
	0.50	6.43 ± 0.16	28.23 ± 0.16	6.91 ± 0.11	0.62 ± 0.16	1.38 ± 0.24^ab

Zootechinical indices	Experiment 1			Experiment 2
Zootechinical indices	0.25	0.50	0.75	0.30	0.40	0.50
Initial length (mm)	14.71 ± 0.31	14.86 ± 0.34	14.81 ± 0.31	17.98 ± 0.28	17.71 ± 0.16	17.73 ± 0.20
Final length (mm)	18.70 ± 1.21^a	17.50 ± 0.61^ab	17.01 ± 0.19^b	19.30 ± 0.31	20.12 ± 0.43	19.08 ± 0.20
RGR length (%)	27.10 ± 7.02^a	17.86 ± 6.53^ab	14.89 ± 3.16^b	7.38 ± 4.52	13.69 ± 6.22	7.64 ± 1.61
Initial weight (g)	0.15 ± 0.01	0.14 ± 0.00	0.15 ± 0.00	0.25 ± 0.04	0.25 ± 0.04	0.15 ± 0.01
Final weight (g)	0.28 ± 0.06^a	0.21 ± 0.03^ab	0.18 ± 0.02^b	0.42 ± 0.01	0.39 ± 0.01	0.37 ± 0.01
Weight gain (g)	0.13 ± 0.05	0.07 ± 0.03	0.03 ± 0.02	0.17 ± 0.02	0.14 ± 0.08	0.11 ± 0.02
SGR weight (%)	1.38 ± 0.06^a	0.90 ± 0.03^ab	0.41 ± 0.02^b	1.11 ± 0.02	1.04 ± 0.09	0.71 ± 0.02
Survival (%)	60.00 ± 0.1^b	88.00 ± 0.1^a	79.99 ± 0.09^ab	37.51 ± 0.16	71.75 ± 0.26	77.50 ± 0.19

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Different letters in the same column represent significant differences (p < 0.05).