Induced Morphological Changes in Larval Rock Bream, Oplegnathus fasciatus, under Starvation

Abstract

: Morphological changes in the reared rock bream, Oplegnathus fasciatus, from hatching to six days after hatching were examined during the early growth stage under starvation. All the larvae died within five days when feeding was delayed for three days after hatching. These results imply that initial larval food should be supplied within two days of hatching. Changes in the pectoral angle and the ratios of eye height to head height, gut height to standard length, and gut height to myotome height in the rock bream are alternative indicators for the identification of starving fish. These indicators might prove useful in evaluating the successful transition from endogenous to exogenous feeding in this species.

Phenotypic effects of antibiotic-induced axenity and egg disinfection in early larval European seabass (Dicentrarchus labraxL.)

“…A possible indication of this pseudo‐starvation state of the xenic was their significantly higher yolk sac depletion rate, similar to starved larvae of brown trout Salmo trutta L., which have been shown to consume yolk more rapidly than fed larvae during the final period of yolk resorption (Raciborski, ). Another indication is the pectoral angle of specimens from both xenic treatments of DX and NX, which was significantly smaller than DA on DAH 11, as this smaller angle has been shown to be an indication of starvation in larvae, with the examples of herring Clupea harengus L., plaice Pleuronectes platessa L. (Ehrlich et al., ) and rock bream Oplegnathus fasciatus (Temminck & Schlegel) (Park et al., ). However, on DAH 15 there were no significant differences between these angles, which might indicate this starvation state was no longer present, or detectable due to the large mortalities on DAH 15 and 16.…”

Embryonic development of Peruvian grunt <i>Anisotremus scapularis</i> (Perciformes: Haemulidae)

“…The mean, standard deviation and confidence interval (significance level 5%) were calculated for each variable. The length of yolk sac was measured according to the morphometric traits described by Park et al (2013). The embryonic development was detailed according to the description for Danio rerio (Kimmel et al 1995) and Lutjanus colorado (Abdo de la Parra et al 2014).…”

Morphological and biochemical effects of food deprivation during the early development of Pacific red snapper Lutjanus peru

“…The ability to withstand starvation by the larvae during the first days of larval development and the time to reach the PNR have been related to egg quality. Some factors, such as egg diameter, larval size at hatching and temperature, have also played an important role in the larval ability to resist starvation (Park et al ., 2013; Wan et al ., 2007).…”

“…In ecological studies and ichthyoplankton surveys, evaluation of the effects of starvation on larvae are useful for identifying starved or emaciated larvae and for calculating more accurate population estimates. The presence of larvae showing signs of starvation and on the PNR may result in erroneous estimates of larval abundance and survival since most larvae at the PNR die within 2 days (Park et al ., 2013; Wan et al ., 2007), affecting recruitment and year‐class strength. The effects of food deprivation on larval form and function have been widely studied and many criteria have been reported to identify starved larvae and to describe and evaluate their nutritional condition, including morphometry (Theilacker, 1980), tissue organization and appearance (Di Pane et al ., 2019), biochemical analysis, (Cousin et al ., 1987), digestive enzyme activities (Yúfera et al ., 1993), and swimming performance and behavioral changes (Blaxter & Ehrlich, 1974; Di Pane et al ., 2019; Laurence, 1972; Shan et al ., 2008).…”