Annual cycles of growth and reproduction in hatchery–reared Florida largemouth bass, Micropterus salmoides floridanus, raised on forage or pelleted diets
Annual cycles of growth and reproduction in hatchery–reared Florida largemouth bass, Micropterus salmoides floridanus, raised on forage or pelleted diets
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孵化场饲养的佛罗里达大口黑鲈 (Micropterus salmoides floridanus) 的生长和繁殖的年度周期，以饲料或颗粒饲料饲养
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
P. Hutson
中科院分区：
文献类型：
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作者：
P. Rosenblum;T. Brandt;K. Mayes;P. Hutson
研究了孵化场饲养的佛罗里达大口黑鱼(Micropterus Salmoides Floridanus)的生长和繁殖的年周期。动物以饲料(金鱼，Carassius auratus)或三文鱼颗粒饲料饲养。在一个完整的年度周期(1-12月)内，对1岁以下的雄性和雌性1岁大口黑鱼进行了采样。在饲料和颗粒饲料饲养的鱼中都观察到了两个阶段的生长周期。直到产卵期(5月)大约中期，鱼的体长或体重都没有增加，在此之后，鱼在研究的剩余时间里以稳定的速度生长。饲料鱼的繁殖周期的特点是性腺指数(GS1)在1-4月间迅速增加，然后是产卵期延长(4-7月)，在此期间GSI逐渐下降。9月和10月观察到性腺完全退行性变，10月至12月观察到性腺复发。内脏脂肪沉积(以肠系膜脂肪指数(MFI)表示)在性腺生长和产卵初期被吸收，并在产卵后阶段恢复。颗粒饲料饲养的鱼的生长和生殖周期与饲料喂养的鱼相似，但在两组饮食中观察到了几个显著的差异。在周期的生长阶段，颗粒饲料饲养的大口黑鱼的生长速度显著快于饲喂饲料的大口黑鱼，并且在一年中的所有时间里，其MFI都显著大于饲料饲养的大口黑鱼。颗粒饲料鱼的GSI也比饲料鱼大得多。这些数据表明，饮食结构可能是该物种生长和生殖功能的重要决定因素。
Annual cycles of growth and reproduction of hatchery–reared Florida largemouth bass, Micropterus salmoides floridanus, were investigated. Animals were raised on either forage (goldfish, Carassius auratus) or a pelleted salmon feed. Male and female year–class 1 largemouth bass were sampled throughout one complete yearly cycle (January–December). A biphasic growth cycle was observed in both forage–fed and pellet–fed fish. No increase in body length or weight was observed until approximately midway through the spawning period (May), after which fish grew at a consistent rate for the remainder of the study. The reproductive cycle of forage–fed fish was characterized by a rapid increase in gonadosomatic index (GS1) between January and April, followed by a prolonged spawning period (April–July) during which GSI progressively declined. Fully regressed gonads were observed in September and October, and a resumption of gonadal recrudescence was observed between October and December. Visceral adipose deposits (expressed as mesenteric fat index; MFI) were resorbed during gonadal growth and the initial stages of the spawning period, and restored during the post–spawning phase. Fish raised on pelleted feed had growth and reproductive cycles that parallelled those of forage–fed fish, but several significant differences were observed between the two diet groups. During the growth phase of the cycle, pellet–fed largemouth bass grew significantly faster than forage–fed largemouth bass, and had significantly larger MFIs than forage–fed largemouth bass at all times of the year. Pellet–fed fish also had significantly larger GSIs than forage–fed fish. These data indicate that diet composition may be an important determinant of growth and reproductive function in this species.