Efecto del fotoperiodo y la temperatura sobre la composicion bioquimica en reproductores silvestres de cabrilla sardinera, Mycteroperca rosacea (Streets, 1877)

Abstract

Efecto del fotoperiodo y la temperatura sobre la composición bioquímica en reproductores silvestres de cabrilla sardinera, RESUMEN. Se estimó el factor de condición (K), el índice gonadosomático (IGS), hepatosomático (IHS) y de grasa visceral (IGV), así como la composición bioquímica en diferentes tejidos de reproductores silvestres de cabrilla sardinera, Mycteroperca rosacea, para evaluarlos a lo largo de un ciclo reproductivo y ver la relación que presentan los cambios con respecto a la temperatura del agua y fotoperiodo de la zona de muestreo. Se capturaron 187 reproductores, 146 hembras y 41 machos en el golfo de California, México. Se observaron diferencias significativas (P < 0,005) en los IGS, IHS e IGV; en el caso de K no se encontraron diferencias. También, se observaron variaciones significativas (P < 0,05) en la mayoría de los parámetros bioquímicos, encontrándose los valores más altos durante la etapa de desove, mientras que los más bajos durante la etapa de reposo. Todos los índices estimados y los parámetros bioquímicos determinados, se correlacionaron significativamente (P < 0,05) con el fotoperiodo, mientras que solo se encontraron correlaciones significativas (P < 0,05) entre el IGS e IGV con respecto a la temperatura del agua. Palabras clave: Mycteroperca rosacea, cabrilla sardinera, ciclo reproductivo, composición bioquímica, fotoperiodo, temperatura, golfo de California.Effect of photoperiod and temperature on the biochemical composition in wild broodstock of sardine cabrilla, Mycteroperca rosacea (Streets, 1877)ABSTRACT. Condition factor (K), gonadosomatic index, (IGS), hepatosomatic index (IHS) and fat visceral index (IGV) were estimated and the biochemical composition in different tissues of wild leopard grouper broodstock was determinate too, in order to evaluate them along a reproductive cycle and see the relationship of these changes with respect to the water temperature and photoperiod in the sampling area. 187 brooders were caught, 146 females and 41 males in the Gulf of California, Mexico. Significant differences (P < 0.005) in the IGS, IHS and IGV but not for K were observed. Significant changes (P < 0.05) were also observed in most of the biochemical parameters, being the highest value during the spawning stage, whereas the lowest occurred during the resting stage. Significant correlations (P < 0.05) between all estimated indices and biochemical parameters were observed, while only significant correlations (P < 0.05) between the IGS and IGV with respect to water temperature.

Detecting Mugil curema (Perciformes: Mugilidae) phenotypic stocks in La Paz Bay, Baja California Sur, Mexico, using geometric morphometrics of otolith shape, growth, and reproductive parameters

“…22201/ib.20078706e.2020.91.3273 Cabello (2004), Kanak and Tachihara (2008), Cabral-Solís et al (2010), andRuiz-Ramírez et al (2017). On the other hand, other authors (Aburto-Oropeza et al, 2008;Albieri, Araújo, & Ribeiro, 2010;Chandrasekhara & Krishnan, 2011;Estrada-Godínez et al, 2014;Volpato & Trajano, 2005) have pointed out that CF is not related to GSI in some tropical fish species because breeding fish do not stop feeding during the maturing and spawning stages. This is the opposite of what is observed in some temperate and cold water species such as salmonids, that stop feeding during the breeding period and use energy reserves from visceral fat and muscle for vital functions, which leads to a clear decrease in CF (Barnham & Baxter, 1998;Bureau et al, 2002).…”

“…Generally, fish reproduce when conditions are appropriate for the greater survival probability of larvae, avoiding periods of low food availability and, therefore, present slow growth (Chellappa et al, 2010). In areas close to the tropics, such as LPB, changes in temperature and photoperiod play an important role in the life cycle of fish, mainly in reproduction (Estrada-Godínez et al, 2014). Reyes-Salinas et al (2003) reported a seasonal trend in primary productivity (PP) in LPB, with 2 peaks per year, the first one in March (16 mg C m-3h-1) (when the photoperiod increases and heat starts to build up), and the second in October (5 mg C m -3 h -1 ) (when the photoperiod decreases and there is heat loss).…”

Biología reproductiva de la corvina rayada Cynoscion reticulatus en una localidad del sureste del Golfo de California

“…Se ha demostrado ampliamente que los cambios anuales en el fotoperíodo son los responsables del inicio de la maduración gonádica, activando el eje reproductivo endocrino de los peces con la consecuente utilización de recursos energéticos por parte de los tejidos reproductivos. En cambio, la temperatura es un factor de sincronización que indica si las condiciones son apropiadas para la reproducción e induce la maduración final de los gametos y el desove (Estrada-Godínez et al, 2014).…”

“…It has been widely demonstrated that annual changes in the photoperiod are responsible for the onset of gonadal maturation, activating the endocrine reproductive axis of fish with the consequent use of energy resources by the reproductive tissues. Instead, the temperature is a synchronizing factor that indicates whether the conditions are suitable for reproduction and induces the final maturation of the gametes and the spawning (Estrada-Godínez et al, 2014).…”

Jejum e insensibilização pré-abate em tilápia nilótica (>i<Oreochromis niloticus>/i<)

“…Foram usados os parâmetros de cor, luminosidade (L*) varia de 0 a 100 (preto a branco); parâmetro a* varia do verde (-) ao vermelho (+); parâmetro b* varia do azul (-) ao amarelo (+)(CIE, 1978). Para a determinação do índice hepatossomático foi utilizada a fórmula IHS (%) = (Wh/Wt) x 100 (em que Wh= peso médio do fígado em g, e Wt = peso médio total do peixe em g) e para o índice viscerossomático IVS (%) = (Wgv/Wt) x 100 (em que Wgt = peso das vísceras em g, e Wt = peso médio, total do peixe, em g)(ESTRADA-GODÍNEZ et al, 2014).Em três filés foram retirados 2g da musculatura (lado esquerdo) periodicamente nos tempos pré-determinados às 0, 3, 6, 24 e 48 horas pós-abate e armazenados em nitrogênio líquido para posterior avaliação da atividade basal das enzimas glutationa redutase (GR), catalase (CAT) e lactato desidrogenase (LDH). Para os ensaios enzimáticos, as amostras dos tecidos musculares foram homogeneizadas em solução resfriada de tampão fosfato 10mM, pH 7,5, utilizando-se um homogeneizador universal (1g de tecido 10mL -1 do tampão), de acordo comLins et al (2006).…”