Effect of starvation on morphometric changes in Rhynchocypris oxycephalus (Sauvage and Dabry)

Abstract

A 75‐day study was conducted to determine the effect of starvation on classical and truss parameters in Rhynchocypris oxycephalus (Sauvage and Dabry). Truss dimensions of almost the entire head and trunk region as well as the abdomen were increased significantly through feeding or starvation (P < 0.05). Truss dimensions of the caudal region generally decreased through feeding or starvation, particularly those dimensions at the hind part of the trunk. There were some significant decreases in classical dimensions of the head region during feeding, in relation to body depth characteristics in the trunk and caudal region during starvation, whereas there was only one decreasing classical dimension in the caudal region during feeding. The results of this study indicate that application of the truss network as a character set enforces classical coverage across the body form, discrimination among experimental groups thus being enhanced. Considering that the dimension of the lower part of the head and some truss and classical dimensions were least affected by feeding and starvation, these dimensions may then be useful as a taxonomical indicator to discriminate the species of Rhynchocypris sp. The value of trunk region dimensions with a large component of body depth in R. oxycephalus is most likely to be compromised by variability related to differences in feeding regimes of fish in different habitats.

Effects of long-term starvation on hepatocyte ultrastructure of olive flounder Paralichthys olivaceus

“…The fish in all experiments were kept until the starved group ceased activity. At the conclusion of the experiment, to avoid sampling fish with guts that were distended by large quantities of food, fish were starved 24 h before sampling (Grove et al, 1978;Park et al, 2001).…”

“…The observed incidence of starvation is essentially the same based on morphological and histological criteria (Theilacker, 1986;Park et al, 2001). Morphological analysis is an attractive approach compared to histological examination because of the relative ease and low cost of measuring fish.…”

Effects of starvation on morphometric characteristics of olive flounder, Paralichthys olivaceus

“…Although a number of studies have described the effect of starvation on histological changes of several tissues for olive fl ounder (Hur et al, 2006a,b;Park, 2006), no studies have characterized the effect of starvation on its morphometric characteristics. Thus, we conducted this study to determine the effects of feeding and starvation on the morphometric A lthough the body shape of fi sh is largely determined by genetic factors (Riddell et al, 1981;Taylor and McPhail, 1985), the use of morphometric differences to discriminate between genetically discrete groups within a single species of fi sh is limited by the diffi culty of measuring environmentally induced variations in body shape (Ihssen et al, 1981;Currens et al, 1989;Park et al, 2001). Consequently, understanding which morphometric characteristics are less affected by various feeding regimens would better enable determination of genetically discrete groups of the same species from habitats in which food abundance and quality differ (Currens et al, 1989).…”

“…Fish overcome starvation by using biochemical, physiological, and behavioral strategies (Weatherley and Gill, 1987;Lee et al, 1999;Hur et al, 2006b;Park et al, 2006). During starvation, essential body processes are maintained at the expense of accumulated (i.e., completely endogenous) energy reserves, resulting in the progressive depletion and wastage of body tissues (Weatherley and Gill, 1987;Park et al, 2001Park et al, , 2006. Detection of starvation based on morphological criteria is essential (Theilacker, 1986), and because of the relative ease and low cost of measuring fi sh, morphological analysis is an attractive approach.…”

Life history traits of the Chinese minnow Rhynchocypris oxycephalus in the upper branch of Yangtze River, China

“…The Chinese minnow Rhynchocypris oxycephalus (Sauvage et Dabry, 1874) is an endemic species of East Asia, widely distributed from southern China to most parts of the Korean Peninsula and western Japan (Chen 1998;Park et al 2001;Ito et al 2002;Sakai et al 2006;Bogutskaya et al 2008;Takai et al 2012). In China, R. oxycephalus is mainly distributed in well-oxygenated montane stream headwaters of Yangtze River Basin (Chen 1998;Zhang and Chen 1997), at the southern-distribution boundary of Rhynchocypris minnows.…”