随着全球气候变暖将改变鱼类的栖息水域

在美国海洋大气厅（NOAA）发表的“2009年环境体系现状报告”指出，从美国东海岸的哈特勒斯角（突入海中的尖形陆地）到加拿大国界为止的沿岸水域，经过了过去40年以上的时间，由于环境体系的变化，许多鱼种离开原来栖息水域而迁移。一方面，

赣东北棘胸蛙蝌蚪栖息地生物因子研究

叙述了赣东北山区越冬后的棘胸蛙蝌蚪栖息地生物因子 ,为棘胸蛙人工培育提供依据。

濒危物种─—新疆大头鱼的生态和资源调查与保护对策的研究

１９９２年起对濒危物种──新疆大头鱼的生态进行了调查。调查的水域有：叶尔羌河、阿克苏河及其上游托什干河和库马里克河、塔里木河、博斯腾湖及上游开都河和天鹅湖、大西海子水库、渭干河水系及克孜尔水库和车尔臣河及新发现的喀依拉克湖等水域，行程１００００多ｋｍ。初步查清了新疆大头鱼的分布范围、生态要求及其数量演变。新疆大头鱼分布的海拔高程为８００～１２００ｍ之间，最高不超越１５００ｍ。栖息于水温较高的静水或缓流的湖泊中，仅为了产卵进行短距离的溯河徊游。现存有新疆大头鱼的水域仅为阿克苏河下游的艾西曼湖群、车尔臣河的喀依拉克湖和渭干河水系的克孜尔水库，并在库区下的河道中发现幼体。目前新疆大头鱼物种已极度濒危。新疆大头鱼系裂腹鱼亚科中生长快、个体大、性成熟年龄晚、繁殖力低的大型食肉性鱼类。运用Ｖｏｎ．Ｂｅｒｔａｌａｎｆｆｙ的理论生长方程求得的生长参数：－Ｋ＝０．０６３；ｔｏ＝０．２７５；Ｌ＝１１８．２ｃｍ；Ｗ＝２５８８４ｇ；ｔｉｐ＝１７．１龄；ｔｍａｘ＝４７．２龄。与历史上捕获的最大个体基本一致。并对新疆大头鱼的食性、繁殖、及其生态环境进行了初步研究。新疆大头鱼濒危的原因：１、新疆大头鱼生物学特性的本身决定它对环境要求苛刻?

Seasonal Gametogenesis of Host Sea Anemone(Entacmaea quadricolor) Inhabiting Hong Kong Waters

Studying gonadal development of annual cycle can reveal the process of gametogenesis and reproductive period, and evaluate fertility and source utilization of a species. Host sea anemones are conspicuous members of tropical and subtropical reef ecosystems, but little is known about its biology including reproductive seasonality. Here we reported a one-year study on the gametogenesis and reproduction of host sea anemone(Entacmaea quadricolor) inhabiting Hong Kong waters. E. quadricolor tissues were sampled in 12 occasions from 5 m and 15 m depths of water, respectively. Histological sectioning of the tissues showed that E. quadricolor was dioecious, and populational ratio of female to male was 1:1.6. The gonadal development was asynchronous within an annual cycle, which included proliferating, growing, maturing, spawning, and resting stages. The spawning occurred between August and October when surface seawater temperature reached the annual maximum(28℃), suggesting that temperature is an important factor modulating the gonadal development and mature of E. quadricolor.

鲫鱼与水温

鲫鱼是淡水变温性鱼,栖息水域底层,体温随水域温度不同而变化。水温的高低,是直接影响鱼体新陈代谢强弱的重要因素。鲫鱼的活动、栖息、摄食、成长、繁殖诸方面,都与水温休戚相关。弄清这一问题,对选窝下钩具有实在意义。