By Raymond J. H. Beverton, Sidney J. Holt
Among the fishes, a remarkably wide selection of organic variations to assorted habitats has developed. in addition to residing within the traditional habitats of lakes, ponds, rivers, rock swimming pools and the open sea, fish have solved the issues of existence in deserts, within the deep sea, within the chilly antarctic, and in hot waters of excessive alkalinity or of low oxygen. besides those variations, we discover the main notable specializations of morphology, body structure and behavior. for instance we will be able to surprise on the high-speed swimming of the marlins, sailfish and warm-blooded tunas, air-breathing in catfish and lungfish, parental care within the mouth-brooding cichlids, and viviparity in lots of sharks and toothcarps. additionally, fish are of substantial significance to the survival of the human species within the type of nutritious, scrumptious and various nutrition. Rational exploitation and administration of our international shares of fishes needs to depend upon a close and distinct perception in their biology. The Chapman & corridor Fish and Fisheries sequence goals to give well timed volumes reviewing vital facets of fish biology. such a lot volumes can be of curiosity to analyze staff in biology, zoology, ecology and body structure yet an extra goal is for the books to be obtainable to a large spectrum of non-specialist readers starting from undergraduates and postgraduates to these with an curiosity in commercial and advertisement features of fish and fisheries.
Read or Download On the Dynamics of Exploited Fish Populations PDF
Best oceans & seas books
Aquaculture and fisheries biotechnology. Genetic approaches
The genetic development of fish for aquaculture and similar fisheries is a box of analysis that has noticeable substantial advances in recent times. but there was no e-book which gives an available assessment of the topic before. The ebook fills this hole within the literature. The contents comprise polyploidy, sex-reversal and breeding, gene mapping and advertisement purposes.
Design and Analysis Methods for Fish Survival Experiments Based on Release-Recapture
Entire theoretical, useful, and analytical remedy of enormous box experiments during which the recapture of marked animals is used to estimate mortality attributable to river dams or different stressors. Statistical layout and software program help are emphasised.
Whale (Reaktion Books - Animal)
100 years in the past, a beached whale may were greeted via a mob wielding flensing knives; this day, humans convey harnesses and boats to assist it go back to the ocean. The whale is likely one of the such a lot awe-inspiring and clever animals in nature, sharing a fancy dating with people that has extensively developed over the centuries.
A Fishery Manager's Guidebook, 2nd Edition
Co-published with the nutrition and Agriculture association of the United Nations. Fisheries administration is the method that has advanced to aim to make sure that fisheries function in a way that offers the fast merits in a sustainable demeanour. the commonly authorized objective is that the whole diversity of advantages will not be in simple terms be on hand for this iteration yet for generations to come back.
- Design and Operating Guide for Aquaculture Seawater Systems
- A field guide to coral reefs of the Caribbean and Florida : a guide to the common invertebrates and fishes of Bermuda, the Bahamas, southern Florida, the West Indies, and the Caribbean coast of Central and South America
- Fisheries Buybacks
Extra info for On the Dynamics of Exploited Fish Populations
Example text
From the economic aspect it is necessary to know the catch per unit effort, and, probably, the mean weight of fish in the catch, while the analysis of situations in which factors such as natural mortality and growth vary with the population density (discussed in Part II of this paper) requires expressions giving the numbers and biomass of the population. Finally, when the behaviour of population models comes to be tested by observation or experiment, or they are used as an adjunct to fishery management, it is of help to obtain from the models predicted values of certain quantities such as the mean length and mean age of fish in the catch, which are directly estimated from samples.
1), that is, it refers to the 'density-independent' component of mortality, whereas the term ""2(t) can be regarded as referring to the 'interaction' between individuals of the population. We have previously mentioned that one of the characteristics of mortality during the early life of fish is that it varies enormously with age, so that we could not expect the coefficients ""1 and ""2 to remain even approximately constant during the pre-recruit phase. For example, it may well be that ""2 is virtually negligible except at certain critical stages.
Owing to the tendency for young larvae to be concentrated in a relatively small area as the result of aggregation of the spawning adults, it is highly probable that the food supply to each is influenced by the number of other larvae in the immediate vicinity, thus producing a mechanism whereby the density of larvae can affect their mortality rate. 1), that is, it refers to the 'density-independent' component of mortality, whereas the term ""2(t) can be regarded as referring to the 'interaction' between individuals of the population.