Ecological observations on juvenile flatfish in a tropical estuary: Arquipélago dos bijagós, Guinea-Bissau

Henk W. Van der Veer , Ewout J. Adriaans , Loes J. Bolle , Norbert Dankers , Luis Malaba Da Fonseca , Paddy A. Walker , Johannes lJ. Witte
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引用次数: 4

Abstract

Juvenile flatfish were studied in a tropical estuary, Arquipélago dos Bijagós in Guinea-Bissau from October 1992 until April 1993. A total of eight flatfish species, belonging to the families Bothidae, Cynoglossidae, Psettodidae and Soleidae, were found. In comparison with other fish groups, flatfishes abundance was low with densities of less than 13 ind·100 m−2. One species, Citharichthys stampflii, occurred in densities high enough to permit an analysis of distribution, growth and mortality. During the period of study, settlement of C. stampflii was observed in the estuary. Its distribution suggested a preference for offshore areas, densities decreasing towards the river systems. Repeated sampling in the intertidal area of Ilheu de Flamingos permitted a preliminary estimate of mortality and growth. Instantaneous mortality rates were about 0.03·d−1, which is similar to estimates in temperate estuaries. Growth rates were slightly above 1 mm·d−1, about the same as those measured in subtropical estuaries.

热带河口幼年比目鱼的生态观测:几内亚比绍Arquipélago dos bijagós
1992年10月至1993年4月,在几内亚比绍的一个热带河口Arquipélago dos Bijagós对幼年比目鱼进行了研究。共发现八种比目鱼,分别隶属于肉毒杆菌科、舌藻科、Psettodidae和Soleidae。与其他鱼类相比,比目鱼的丰度较低,密度小于13 ind·100 m−2。其中一个物种,Citharichthys stampflii,其密度高到足以分析分布、生长和死亡率。在研究期间,在河口观察到了C.stampflii的沉降。它的分布表明它更倾向于近海地区,密度向河流系统递减。在Ilheu de Flamingos潮间带重复采样,可以初步估计死亡率和生长情况。瞬时死亡率约为0.03·d−1,与温带河口的估计值相似。生长速率略高于1 mm·d−1,与亚热带河口的生长速率大致相同。
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