The effect of temperature on growth and energy budget of the polychaete, Neanthes japonica Izuka

Abstract

Growth and energy budget of the polychaete, Neanthes japonica, at various temperatures (17, 20, 23, 26 and 29℃) were investigated in this study. The growth, as indicated by final dry weight and specific growth rate (SGR), increased with increasing temperature, with the maximum level at 26℃, and then decreased significantly at 29℃. A similar trend was observed in feeding rate, food conversion efficiency (FCE) and apparent digestive rate (ADR). However, no significant differences were detected in ADR among all the temperature treatments. In the pattern of energy allocation, faeces energy was only a small component of energy budget and had little influence on the proportion of food energy allocated to growth. The metabolic energy accounted for a large portion of energy intake for each temperature treatment. The nitrogen excretion was appreciable with changing temperature. The two expenditure terms (respiration energy and excretion energy) in energy budget were the major factors influencing the proportion of food energy allocated to growth. These results revealed that temperature affected the growth of N. japonica mainly by influencing feeding rate and FCE. In addition, regression equations describing the relationship between feeding rate, faecal production, SGR, FCE and temperature were obtained. The optimum temperatures for feeding rate, FCE and SGR were estimated at 25.01℃, 24.24℃ and 24.73 ℃, respectively, from the regression equations.

Fish culture waste improves growth and fatty acid composition of the polychaete Namalycastis sp. (Nereididae) and its potential use as feed for mud crabs

“…The temperature experiment noted some worm mortalities even after just 22 days, with survivorship at 62.5 ± 12.5% for the cooled treatment and 81.3 ± 12.0% for the ambient treatment. In contrast, Liu and Xian (2009) reported zero worm mortalities after 20 days when examining the effects of temperature on growth and energy budget of the polychaete Neanthes japonica . Environmental conditions may not have been optimal, but the semelparous nature of reproduction in Namalycastis may have resulted in the mortalities observed in our study.…”

“…This results in greater variation in WW. Liu and Xian (2009) measured initial and final dry weight of their worms but the initial weight was estimated using a separate sample of worms. A similar approach can be adopted for future studies on the growth of Namalycastis if sufficient number of worms of the same species can be obtained.…”

“…This results in greater variation in WW. Liu and Xian (2009) measured initial and final dry weight of their worms but the initial weight was estimated using a separate sample of worms.…”

Efecto de la temperatura y salinidad en la mortalidad de adultos de Capitella sp. (Polychaeta: Capitellidae) en el laboratorio

“…Este comportamiento también se evidencia en el coeficiente de variación, donde los valores de temperatura, se estabilizaron a mitad del primer tratamiento, sugiriendo que los intervalos de temperatura de su hábitat serían los óptimos para su cultivo en el laboratorio. Esto se puede explicar porque la temperatura es un factor importante que determina los parámetros biológicos en la comunidad bentónica dentro del ecosistema marino al estar vinculada a los procesos físicos-químicos del sedimento y columna de agua, influyendo en su distribución, abundancia y flujo energético (Hutching, 1998;Méndez, 2007;Liu & Xian, 2009;Custodio & Cosme, 2016;Jiménez, 2016).…”

“…El cambio de temperatura también influye en los requerimientos metabólicos y procesos relacionados con la transformación y el consumo del alimento, en el crecimiento (Prevedelli, 1991;Calderer, 2001), equilibrio osmótico y función enzimática (Snelgrove, 1999), flujo de energía y procesos fisiológicos (Liu & Xian, 2009). Por ejemplo, Liu & Xian (2009) señalan que temperaturas anormales ocasionarían el incremento de la excreción del nitrógeno como resultado del incremento catabólico en los aminoácidos o en la síntesis de péptidos, relacionados a la regulación osmótica. La temperatura es también un factor influyente en la fecundidad durante la etapa reproductiva, en el tamaño de los huevos, y en el desarrollo de las fases larvales y juveniles en los poliquetos (Quian & Chia, 1992).…”