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首页> 外文期刊>Marine biology >Population biology and life strategies of Chlorophthalmus agassizii Bonaparte, 1840 (Pisces: Osteichthyes) in the Mediterranean Sea
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Population biology and life strategies of Chlorophthalmus agassizii Bonaparte, 1840 (Pisces: Osteichthyes) in the Mediterranean Sea

机译：地中海小球藻波那巴的种群生物学和生活策略，1840年（双鱼座：Osteichthyes）在地中海中

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The population biology and life strategies of Chlorophthalmus agassizii were studied in the Ionian Sea (eastern-central Mediterranean) using the data collected during the experimental trawl surveys carried out from 1995 to 2000. Depth-related trends of both density and size were found. With depth the former decreased while the latter increased. A typical bigger-deeper phenomenon was detected: young-of-the-year individuals occur on the shelf during autumn-winter months and move towards bathyal bottoms as they grow. The sampled population was made up of several size age groups. The maximum age of 8 years was identified by means of otolith readings. The Von Bertalanffy growth parameters were estimated from the age-length key (L_∞=189.04±5.401 mm; k = 0.24±0.021; t_o = -1.20± 0.132; φ'= 3.94) and modal progression analysis (L_∞ = 218.33±18.397 mm; k = 0.164±0.028; t_o = -1.694±0.171; φ' = 3.89). Reproduction of this monoecious fish was observed during summer-early autumn. Considering the female portion of the gonad, the size at attainment of 50% maturity was 115 mm TL. The corresponding age is within the third year of life. The simultaneous occurrence of oocytes in different development stages was shown in the ovary. Both the asynchronous ovary and oocyte size distribution indicate that C. agassizii spawns more than once during a reproductive season (batch spawner). Functional fecundity (on average 3,018 hydrated oocytes) was between 37 and 69% of the absolute fecundity and increased significantly with the individual size. Since adult specimens are mostly distributed on the slope, eggs and larvae develop in epipelagic waters and migrate in-shore where juvenile forms recruit on the shelf. Juveniles migrate ontogenetically towards deeper bottoms and after 23 years start to reproduce annually within a life span greater than 10 years.
机译：利用从1995年至2000年进行的拖网调查收集的数据，在爱奥尼亚海（地中海中东部）研究了绿眼球藻的种群生物学和生活策略。发现了与深度有关的密度和大小趋势。随着深度的增加，前者减少，而后者增加。发现了一个典型的更大更深的现象：年少的个体在秋冬期间出现在架子上，并随着它们的生长而移向深海底部。抽样人群由几个不同年龄段的人群组成。通过耳石读数确定最大年龄为8岁。冯·贝塔兰菲的生长参数是根据年龄长度键（L_∞= 189.04±5.401 mm; k = 0.24±0.021; t_o = -1.20±0.132;φ'= 3.94）和模态进行分析（L_∞= 218.33± 18.397毫米; k = 0.164±0.028; t_o = -1.694±0.171;φ'= 3.89）。在夏季初秋期间观察到这种雌雄异体的鱼的繁殖。考虑到性腺的雌性部分，达到50％成熟度的大小为115 mm TL。相应的年龄在生命的第三年之内。在卵巢中显示了卵母细胞在不同发育阶段的同时发生。异步卵巢和卵母细胞的大小分布均表明，无性梭状芽胞杆菌在生殖季节产卵不止一次（批量产卵）。功能繁殖力（平均3018个水合卵母细胞）在绝对繁殖力的37％至69％之间，并且随着个体大小的增加而显着增加。由于成年标本大多分布在斜坡上，因此卵和幼虫在表层水域中生长，并向近岸迁移，在那里幼体被募集到架子上。幼虫在个体发育上向更深的底部迁移，并且在23年后开始在超过10年的寿命中每年繁殖。

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