Author: Max Weber
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 434

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Book Description

Author: Max Weber
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 434

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Book Description

Author: Max Carl Wilhelm Weber
Publisher: Brill Archive
ISBN:
Category : Fishes
Languages : en
Pages : 434

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Book Description

Author: Max Wilhelm Carl Weber
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 442

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Book Description

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Book Description

Author: Walter J. Rainboth
Publisher: Food & Agriculture Org.
ISBN: 9789251037430
Category : Business & Economics
Languages : en
Pages : 340

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Book Description
This field guide covers the major resource groups likely to be encountered in the fisheries of the Cambodian Mekong. These groups include sharks, batoid fishes and bony fishes. The introduction outlines the geographical, environmental and ecological factors influencing fisheries, and the basic components of the fisheries of the Cambodian Mekong. As an aid to identification to higher taxonomic levels, a pictorial index to families and an illustrated guide to orders and families are included. Each species account provides scientific nomenclature, FAO names in English, local names, sizes, notes on fisheries, habitat and biology, and one or more illustrations. The guide is fully indexed and a list of related literature is appended. Finally, 27 colour plates are presented.

Author: Max Weber (Zoologue.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 410

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Book Description

Author: Max Weber
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 436

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Book Description

Author: Max Wilhelm Carl Weber
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 0

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Book Description

Author: Yu.G. Aleyev
Publisher: Springer Science & Business Media
ISBN: 9401013241
Category : Science
Languages : en
Pages : 430

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Book Description
1. Nekton as an ecomorphological type of biont The term nekton was suggested and used for the first time in 1890 by E. Haeckel in his book Plankton-Studien. Etymologically the word nekton derives from the Greek VTJKTTJP, i.e. swimming. As Haeckel defined it, nekton describes collectively all swimming animals that are 'free to choose their path', i.e. can resist a strong current of water and, distinct from planktonic animals, go where they wish. While giving a general idea of the dividing line between plankton and nekton, Haeckel's definition, which has played an important role in shaping our ideas about nekton, today no longer provides a sufficient basis for ecological and functional morphological investigations, since it affords no possibility of quantitatively assessing either the boundary between plankton and nekton or that between nekton and other ecomorphological types of biont. Thus Parin (1968), proceeding from Haeckel's principle, believes that in the epipelagic zone of the ocean the minimum size of nektonic fishes with a well-developed capacity for active swimming may be between 15 and 30 cm, as fishes shorter than 15 cm are unable to counter oceanic currents. Meanwhile young Leucaspius (Leucaspius delineatus) only 1.5 cm long, observed by this writer in ponds near Moscow proved capable of active horizontal migrations across the entire body of water, which, if Haeckel's definition is accepted, brings the border between planktonic and nektonic fish in this case to between 1.5 and 2.0 cm.