保安湖沙塘鳢的食性、繁殖、年龄及生长的研究
A STUDY ON FEEDING, REPRODUCTION, AGE AND GROWTH OF DARK SLEEPER ODONTOBUTIS OBSCURA IN BAO'AN LAKE
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摘要: 保安湖沙塘鳢1冬龄成熟,雌雄比1:1.34,4月初至6月中旬繁殖;个体绝对繁殖力540-1943egg(1154±314egg).渔获物中以体长8.0-14.0cm,体重10.0-40.0g,2、3龄个体为主。体长-体重关系为W=0.02129L3.0585.3龄前生长较快;雄鱼略快于雌鱼。肥满度冬春季较高,最高在3月。体长和体重与年龄的关系可用Bertalanffy生长方程描述,参数分别为：雌鱼L∞=15.29cm,k=0.4072,t0=0.1596,W∞=84.9g;雄鱼L∞=16.71cm,k=0.3736,t0=0.1095,W∞=118.5g;体重生长拐点年龄和拐点体重雌鱼分别为2.86a和25.1g,雄鱼3.13a和35.4g.Abstract: The feeding, reproduction, age and growth of dark sleeper [Odontobutis obscura (Temm. et Schl.)] were studied annually. The dark sleeper is a carivor,preying mainly on shrimps and small fishes as well as on aquatic insect larvae. Bothsexes of dark sleeper reach their sexual maturity at 1 year old. The sex-ratio (♀：♂)is 1:1. 34 in total, with great fluctuation around the breeding season. The breedingseason lasts from early April to mid-June. Dark sleeper spawns in "nest" and themale guards in the nest The individual absolute fecundity varies from 540 to 1943eggs (1154 ±317 eggs on average). In the capture, 2-and 3-year-old individualswere the majority, and individuals of 8.0cm to 14.0cm in body length and 10.0g to40.0g in body weight were met frequently. The relationship between body-length andbody-weight can be expressed as W=0.02129L3.0585. The males grow faster than thefemales. Individuals of both sexes slow their growth down at age of 3. Theparameters of VBGF (von Bertalanffy Growth Formula) is♀：L∞ = 15.29cm, W∞=84.9g, t0 = 0.1596, k = 0.4072,♂： L∞ = 16.71cm, W∞= 118.5g, t0 = 0.1095, k=0.3736. The inflexion point of female's bodyweight growth curve is at age (ti) of 2.9a and body-weight (Wi) of 25.1g, that of male's is at age (ti) of 3.1 a andbody-weight (Wi) of 35.4g.
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Keywords:
- Bao'an Lake /
- Dark sleeper /
- Feeding /
- Reproduction /
- Age and growth
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