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Avaliação de parâmetros de cultivo de Lysmata debelius Bruce, 1983 ao longo do desenvolvimento larvar e juvenil
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Abstract(s)
A presente dissertação teve como principal objetivo completar o ciclo de vida do camarão-de-fogo, de Lysmata debelius Bruce, 1983, em condições controladas de cativeiro, contribuindo para a sua domesticação e para o avanço da aquacultura ornamental. Para tal, foram definidos três eixos centrais de investigação: determinar o período até à obtenção de indivíduos com tamanho comercial, avaliar a influência da densidade de cultivo e da luz LED azul e branco (azul: 450-470nm e branco: 450-700nm) na sobrevivência e no assentamento larvar. Estes fatores são considerados determinantes para a definição de protocolos de cultivo eficientes e sustentáveis.
Os resultados demonstraram que a sobrevivência larvar de Lysmata debelius foi fortemente influenciada pela densidade de cultivo, com melhores valores registados nas densidades mais baixas (90–140 larvas L-1. A taxa de assentamento não revelou diferenças estatisticamente significativas entre tratamentos. O tempo até ao primeiro assentamento foi mais curto nos ensaios sem luz (81,67 ± 2,31 dias), em comparação com aqueles conduzidos sob luz LED azul e branco (89,67–93,33 dias), embora sem diferenças estatisticamente significativas. Por outro lado, o tempo médio total até ao assentamento mostrou diferenças estatisticamente significativas na ausência de luz, situando-se entre 86,67 e 91,18 dias, face a 93,50–96,82 dias em presença de luz, sem efeito relevante da densidade. Finalmente, ao integrar as fases larvar e juvenil, estimou-se que o período total desde a desova até às dimensões do tamanho comercial (3 cm), variou entre 194 e 202 dias. Estes resultados, fornecem uma base sólida para a compreensão da biologia larvar de L. debelius, fundamental para a otimização dos protocolos de cultivo desta espécie e reforçam a necessidade de considerar múltiplos fatores ambientais e de manejo no desenho de sistemas produtivos. Do ponto de vista prático, esta investigação confirmou a viabilidade da produção sustentável desta espécie, abrindo caminho para reduzir a pressão sobre populações selvagens e responder à crescente procura do mercado. A consolidação de protocolos larvares e reprodutivos representa um passo essencial para a expansão da aquacultura ornamental, promovendo práticas mais responsáveis e ambientalmente sustentáveis, resultando numa menor dependência de exemplares capturados em populações naturais. Em forma conclusiva, este trabalho estabelece as bases para o cultivo controlado de Lysmata debelius, representando um contributo científico e aplicado relevante para a sua domesticação e para a consolidação da aquacultura ornamental como setor sustentável e inovador.
The main objective of this dissertation was to complete the life cycle of the fire shrimp, Lysmata debelius Bruce, 1983, under controlled captive conditions, contributing to its domestication and to the advancement of ornamental aquaculture. To this end, three central research axes were defined: determining the time required to obtain individuals of commercial size, assessing the influence of culture density, and evaluating the effect of blue and white LED light (blue: 450–470 nm; white: 450–700 nm) on larval survival and settlement. These factors are considered essential for establishing efficient and sustainable culture protocols. The results showed that larval survival of Lysmata debelius was strongly influenced by culture density, with higher values recorded at lower densities (90–140 larvae L⁻¹). Settlement rate did not show statistically significant differences among treatments. The time to first settlement was shorter in trials conducted without light (81.67 ± 2.31 days) compared with those under blue and white LED illumination (89.67–93.33 days), although differences were not statistically significant. In contrast, the mean total time to settlement differed significantly in the absence of light, ranging between 86.67 and 91.18 days, compared with 93.50–96.82 days under light, with no relevant effect of density. Finally, when integrating the larval and juvenile phases, the total period from spawning to attainment of commercial size (3 cm) was estimated to range between 194 and 202 days. These findings provide a solid foundation for understanding the larval biology of L. debelius, which is essential for optimizing culture protocols for this species, and they highlight the need to consider multiple environmental and husbandry factors when designing production systems. From a practical standpoint, this study confirmed the feasibility of sustainable production of this species, paving the way to reduce pressure on wild populations and meet increasing market demand. The consolidation of larval and reproductive protocols represents a key step toward the expansion of ornamental aquaculture, promoting more responsible and environmentally sustainable practices and reducing dependence on wild-caught specimens. In conclusion, this work establishes the basis for the controlled culture of Lysmata debelius, representing a relevant scientific and applied contribution to its domestication and to strengthening ornamental aquaculture as a sustainable and innovative sector.
The main objective of this dissertation was to complete the life cycle of the fire shrimp, Lysmata debelius Bruce, 1983, under controlled captive conditions, contributing to its domestication and to the advancement of ornamental aquaculture. To this end, three central research axes were defined: determining the time required to obtain individuals of commercial size, assessing the influence of culture density, and evaluating the effect of blue and white LED light (blue: 450–470 nm; white: 450–700 nm) on larval survival and settlement. These factors are considered essential for establishing efficient and sustainable culture protocols. The results showed that larval survival of Lysmata debelius was strongly influenced by culture density, with higher values recorded at lower densities (90–140 larvae L⁻¹). Settlement rate did not show statistically significant differences among treatments. The time to first settlement was shorter in trials conducted without light (81.67 ± 2.31 days) compared with those under blue and white LED illumination (89.67–93.33 days), although differences were not statistically significant. In contrast, the mean total time to settlement differed significantly in the absence of light, ranging between 86.67 and 91.18 days, compared with 93.50–96.82 days under light, with no relevant effect of density. Finally, when integrating the larval and juvenile phases, the total period from spawning to attainment of commercial size (3 cm) was estimated to range between 194 and 202 days. These findings provide a solid foundation for understanding the larval biology of L. debelius, which is essential for optimizing culture protocols for this species, and they highlight the need to consider multiple environmental and husbandry factors when designing production systems. From a practical standpoint, this study confirmed the feasibility of sustainable production of this species, paving the way to reduce pressure on wild populations and meet increasing market demand. The consolidation of larval and reproductive protocols represents a key step toward the expansion of ornamental aquaculture, promoting more responsible and environmentally sustainable practices and reducing dependence on wild-caught specimens. In conclusion, this work establishes the basis for the controlled culture of Lysmata debelius, representing a relevant scientific and applied contribution to its domestication and to strengthening ornamental aquaculture as a sustainable and innovative sector.
Description
Keywords
Aquacultura ornamental densidade de cultivo luz LED azul e branco sobrevivência larvar assentamento larvar