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首页> 外文期刊>Journal of Fish Biology >Hyperplastic and hypertrophic growth of lateral muscle in blackspot seabream Pagellus bogaraveo from hatching to juvenile
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Hyperplastic and hypertrophic growth of lateral muscle in blackspot seabream Pagellus bogaraveo from hatching to juvenile

机译：从孵化到幼年黑点鲷Pagellus bogaraveo的外侧肌增生和肥大生长

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摘要

To understand better the growth mechanisms in the economically important fish Pagellus bogaraveo, in terms of muscle fibre hyperplasia v. hypertrophy, the lateral muscle of this fish was studied morphometrically from hatching to juvenile comparing rostral and caudal locations. Fish were sampled at 0, 5, 23, 40, 70, 100, 140 and 180 days. Fibre types were first identified by succinate dehydrogenase (SDH) and immunostaining with a polyclonal antibody against fish slow myosin (4-96). Morphometric variables were then measured in transverse body sections, at both post-opercular and post-anal locations, to estimate the following variables: total muscle area [A (muscle)], total fibre number [N (fibres)], fibre number per unit area of muscle [N-A (fibres, muscle)] and cross-sectional fibre area [a (fibres)] of the two main muscle fibre types (white and red). Overall, growth throughout the various stages resulted from increases both in the number and in the size of muscle fibres, paralleled by an expansion of the [A (muscle)]. Nonetheless, that increase was not significant between 0-5 days on one hand and 100-140 days, on the other hand. On the contrary, the [N-A (fibres, muscle)] declined as the body length increased. Analysis of the muscle growth kinetics suggested that, within the important time frame studied, hyperplasia gave the main relative contribution to the increase of white muscle [A (white muscle)], whereas red muscle [A (red muscle)] mainly grew by hypertrophy, with both phenomena occurring at a faster pace posteriorly in the body. Finally, when comparing rostral and caudal locations, a greater [N (fibres)] and [A (muscle)] of the posterior white and red fibres were the consistent features. It was also observed that the proportion of the cross-sectional area of the myotomal muscle comprised of white muscle was greater in the anterior part of the fish.
机译：为了更好地了解经济上重要的鱼类Pagellus bogaraveo的生长机理，就肌肉纤维增生对肥大而言，从孵化到幼年形态学研究了该鱼的侧肌，比较了鸟嘴和尾鳍的位置。在0、5、23、40、70、100、140和180天对鱼进行采样。首先通过琥珀酸脱氢酶（SDH）鉴定纤维类型，并用针对鱼类慢肌球蛋白的多克隆抗体免疫染色（4-96）。然后，在手术后和肛门后的位置在横切面上测量形态学变量，以估计以下变量：总肌肉面积[A（肌肉）]，总纤维数[N（纤维）]，每根纤维数两种主要的肌肉纤维类型（白色和红色）的肌肉单位面积[NA（纤维，肌肉）]和横截面纤维面积[a（纤维）]。总的来说，在各个阶段的增长都是由于肌肉纤维的数量和大小的增加，以及[A（肌肉）]的膨胀所致。但是，这一增加在一方面0-5天到100-140天之间并不明显。相反，[N-A（纤维，肌肉）]随着体长的增加而下降。对肌肉生长动力学的分析表明，在研究的重要时间段内，增生是白肌[A（白肌）]增加的主要相对贡献，而红肌[A（红肌）]主要由肥大而增长，这两种现象都在人体后部以更快的速度发生。最后，比较鼻尖和尾端位置时，后部白色和红色纤维的[N（纤维）]和[A（肌肉）]较大，这是一致的特征。还观察到，在鱼的前部，由白肌组成的肌层肌肉的横截面积的比例更大。

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