Evaluating the role of endogenous and exogenous features on larval hake nutritional condition

Abstract

Variability in fish recruitment is a consequence of various processes that operate at different spatial and temporal scales. To understand this variability, it is necessary to study the factors that determine the survival of the early developmental stages of fish. These factors can be both physical and trophodynamic and act throughout the pre-recruit life of fish (Houde, 2008). Nutritional condition assessment allows evaluating the individual physiological state of larvae, which is an echo of the environmental

RNA/DNA and derived condition indices for anchovy and hake larvae as relevant information for comprehensive fisheries management

“…It is evident that frontal systems play a fundamental role in the ecological processes of the ocean because they allow a high primary production, they are suitable areas for the reproduction and feeding of many nektonic species, they offer a suitable breeding environment for the feeding of the early stages of fish development, and they act as retention zones (Acha et al 2004). NPFS could also be an area with a high concentration of prey, predators and competitors of anchovy and hake eggs and larvae (Mianzan and Guerrero 2000, Álvarez-Colombo et al 2003, Diaz et al 2016, 2020.…”

Changes in Growth and Feeding Characteristics during Early Ontogenesis in Threadsail Filefish, Stephanolepis cirrhifer

“…During the transition from endogenous to exogenous nutrition, juveniles have adaptive ecological strategies in response to hunger stress, and they can extend their tolerance to hunger to maintain their development rate [43]. In this state, the larvae begin to consume nutrients derived from their own tissues to meet their energy needs, leading to a decrease in the survival rate of the seedlings during artificial breeding [44]. As a result, if food is supplied too early during seedling cultivation, it is not utilised because the larval mouth crack is not completely formed and the digestive tract is not fully connected; if fed too late, the larvae reach the PNR stage before adequate food is available and begin to lose their feeding ability, resulting in a decreased survival rate.…”