By Harold M. Tyus
""Overall, this quantity bargains an excellent review of concerns which are now severely vital in efforts to take care of either fisheries and the ecosystems that aid them and within the efforts to take care of biodiversity. ... the examples supplied and the general intensity of insurance, besides the enticing writing type, mix to make this a truly readable and informative book.""-Susan A. Foster and John A. Baker, Clark Read more...
summary: ""Overall, this quantity deals a great evaluation of matters which are now significantly very important in efforts to take care of either fisheries and the ecosystems that help them and within the efforts to keep up biodiversity. ... the examples supplied and the general intensity of assurance, besides the enticing writing type, mix to make this a truly readable and informative book.""-Susan A. Foster and John A. Baker, Clark collage, Worcester, Massachusetts, The Quarterly assessment of Biology, Vol. 89, No. 1, 2014""Tyus (emer., Univ. of Colorado at Boulder) makes an attempt to higher teach destiny fisheries manag
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Additional resources for Ecology and Conservation of Fishes
Sample text
1). They are considered to be craniates but represent vertebrates only in a very general sense. They have a cranium, but it is made of fibrous tissue and not of cartilage or bone. 2). On the other hand, hagfishes have been very successful organisms, as reflected by their very long existence. Perhaps this is a case of finding and dominating a niche early. It seems that their niche has not been contested by teleosts, and at least part of their success is due to some interesting adaptations. Hagfishes are able to tolerate hypoxia, their wormlike shape and strange teeth assist in feeding, and production of slime provides defense against predation (Ilves and Randall 2007).
Also, oxygen saturation is about 1/21 less than in air. About 53% of the sun’s rays that penetrate water are absorbed in the first meter, and light waves are absorbed differently. Red is lost quickly, and the most penetrating color is blue/violet. Fish are morphologically adapted to life in water, and most are streamlined to reduce friction. However, some are not streamlined; many are flattened, which is an adaptation for obtaining food. Fish are so well adapted to water that they can swim almost as fast as a bird can fly.
This is difficult to interpret from fossils because of several factors. Passage of time in geological scales has obscured the fossil record, other soft-bodied organisms do not make very good fossils, and their presence would be difficult to detect. But there are other problems with potential reconstruction of aquatic life over millions of years. Fishes evolved in a marine environment, where sedimentation is slow and the corrosive effects of salt water dissolve hard structures. But more importantly, most fossil evidence from ancient oceans has been destroyed by plate tectonics.
