Reproduction, growth and age of southern fin whales

  • 486 Pages
  • 0.74 MB
  • English
University Press , Cambridge
Finback whale -- Southern Hemisphere., Finback whale -- Reproduction., Finback whale -- Growth., Finback whale -- Age determina
Statementby R.M. Laws.
SeriesDiscovery reports -- v. 31
ContributionsNational Institute of Oceanography of Great Britain.
LC ClassificationsQ115 .D7 v.31, QL737.C424 L38 1961
The Physical Object
PaginationP. [327]-486, [4] leaves of plates :
ID Numbers
Open LibraryOL20698647M

Reproduction, growth and age of southern fin whales Author: Laws, R. Contents 'Discovery' reports 'Discovery' reports. About. Title: I growth and age of southern fin whales book a detailed study of a series of pairs of fin-whale ovaries collected at relatively short post-mortem times ( hr.).

The main purpose of this study was an investigation of the variations in the. Reproduction, growth and migrations of sei whales Balaenoptera borealis off the west coast of South Africa.

South African Journal of Marine Science: Vol. 24, No. 1, pp. Cited by: on age, growth, reproduction and migratory character- catch of southern sei whales increased dramatically. from 3 in to a maximum of 22 in that preferred by fin whales.

Reproduction, growth, and. age. southern fin whales. Discovery Rep. 31 Due to the seasonal difference between the Northern and Southern Hemispheres, fin whale. From Antarctic female Fin Whales, Balaenoptera physalus, a collection, consisting of baleen plates and the parts of these plates embedded in the gum, ovaries, and a number of earplugs was examined, in order to determine the age of these animals and to get a better insight in some characteristics of their by: 3.

REPRODUCTION, GROWTH AND AGE OF SOUTHERN FIN WHALES By R. Laws (Plates IV-VII and Text-figs. ) GENERAL CONSIDERATIONS Introduction In his paper on the southern stocks of whalebone whales, Mackintosh () summarized the work which had then been published and discussed some additional unpublished data He remarked that' In recent years a good deal of new.

Mean age at sexual maturity of different year classes of south- ern fin whales estimated from the earplug growth layers (after Lockyer. 52 Ray Gambell sampled in the early s shows an average age at ma- turity of around 7 years (Masaki, ). We used the length of each whale to estimate their age, following the cetacean growth curve equations for female and male whales based on the Laird/Gompertz model (Bloch et al., ).

Details of. Reproduction, growth and age of southern fin. whales. Discovery Report (Books), London. While the winter distribution of the Southern Hemisphere fin whales is still debated.

Growth and reproduction of the northern right whale dolphin, Lissodelphis borealis, in the offshore waters of the North Pacific Ocean September Canadian Journal of Zoology 71(12) There are very rough estimates for specific regions: North Atlantic - 53, whales; Mediterranean Sea - fewer t whales; North Pacific – 17, whales; Southern Hemisphere - 38, whales.

Currently the Fin whale is classified as Endangered (EN). Ecological niche. Fin whales have a place at the top in the food chain and an important. This book examines in detail the impact of the extermination of whales on the Southern Ocean ecosystem and recommendations for control of the current state of whale populations are put forward.

The perspectives of whale population recovery are estimated and discussed. Readability of ear plug growth layers decreased with age in females but showed no clear trends in males.

Minimum size limits of the fishery produced a selective fishing mortality rate in whales up to 5 years of age. Hence, only age-classes older than 5 years have been included in the fitting of the growth curves. Fully grown females are m. Whale Reproduction and Care of Young.

Male whales are mature between 7 and 10 years of age. They have a cavity that their genitals remain in during resting and swimming so there isn’t a great deal that is known about them in great deal.

For females maturity occurs about 5 to 7 years of age. About this book.

Details Reproduction, growth and age of southern fin whales EPUB

Based on actual data of Soviet whaling, and reliable methodologies that existed at the time when Whales of the Southern Ocean was written, it examines the distribution and migration patterns of whales of the Southern Ocean. It defines distinct populations on the basis of phenes, as well as whale breeding zones, which are located in the adjacent to the Southern Ocean waters at.

Reproduction, Growth and Age of Southern Fin Whales: R M Laws November Volume XXXII; pp. 1– Plates I - II Salpa fusiformis Cuvier and Related Species P Foxton October 33 - Plate III The Natural History and Geography of the Antarctic Krill (Euphausia superba Dana) James Marr November Volume XXXIII; pp.

1– Charts 1 -   Results Foetal growth curve Model In order to obtain a reasonable model indicating foetal growth of southern minke whales, the formula of Hugget and Widdas [5] was used: W lt3 = a (t- to) (1) where W is the body weight in grams, a is a growth velocity constant, t is the time in days since conception and to is the intercept where the linear part.

Fin whale Table 9 Demographic parameter estimates for fin whales obtained from the literature Population Source Parameter Value In general Taylor et al. () Age at first repro 10 years Interbirth interval years Calf survival Survival (non-calf) Mediterranean Arrigoni et al.

() Calf mortality Juv mortality   To help remedy confusion in terminology, a more descriptive phrase, growth layer group (GLG), was coined at a workshop held in on estimating age in toothed whales and sirenians (Perrin and Myrick, ), predominantly in reference to dentine.

Its use has expanded, however, to other marine mammal species and to cement as well as dentine. The fin whale (Balaenoptera physalus), also known as finback whale or common rorqual and formerly known as herring whale or razorback whale, is a cetacean belonging to the parvorder of baleen is the second-largest species on Earth after the blue whale.

The largest reportedly grow to m ( ft) long with a maximum confirmed length of m (85 ft), a maximum recorded weight of. The impact of the extermination of whales on the Southern Ocean ecosystem is examined, recommendations for control of the current state of whale populations are given, and perspectives of whale population recovery are estimated.

Regions that could be used as testing areas for whale registration method are defined. The southern fin whale (Balaenoptera physalus quoyi) is a subspecies of fin whale that lives in the Southern Ocean. Along with the impacts of whaling, slower reproduction rate of the species may affect population recoveries as the total population size is predicted to be at less than 50% of its pre-whaling state by ground for southern right whales in Australia, and most calves are born between late May and early September, with a peak in August (Burnell & Bry-den ).

Southern right whale females reach sex-ual maturity as early as 5 yr of age, with a mean age of first calving of yr recorded for the Australian population (Burnell ). The female whale reaches sexual maturity at about six to 10 years of age, while males only become sexually mature when they are between 10 and 13 years old.

However, in the wild, the age of sexual activity and reproduction are influenced, not only by age, but also by external factors (season, migration, availability of partners, competition.

On the size and stock of Antarctic Fin Whales relative to the size of the catch. By Ottestad, Per.

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SKU# Reproduction, growth and age of Southern Right Fin Whales. By Laws, R. SKU# Learn More. Natural History Books Keokuk Street Iowa City, IA Voice: () Home» Exhibitions» Current Exhibitions» Whales Today» Biology» Reproduction and Growth. Reproduction and Growth.

Description Reproduction, growth and age of southern fin whales PDF

Lengths of gestation. The three species of baleen whale that hang in the Jacobs Family Gallery have pregnancies that last months. Sperm whales typically gestate for. The development of a blue whale (Balaenoptera musculus) from a zygote to a ‐m, 2,–3, kg neonate (Reidenberg and Laitman, ) is remarkable for both its rapid increase in size and for the reorganization of multiple mammalian anatomical systems for life in the of the transitions of size and morphology during blue whale development is limited by access to fetal specimens.

Killer whales at sexual maturity also exhibit a spike in dorsal fin growth, where male dorsal fins reach heights of m, while female dorsal fins only reach heights of m (Kastelein ). Most cetaceans overall show some degree of sexual dimorphism, where one gender grows larger or faster than the other.

Social Structure Reproduction and growth. Killer whales live in tightly bonded family groups. Females typically give birth to their first calf at years, and have one of the longest gestation periods known for whales and dolphins at months 3. Calves usually nurse for up to one year, and begin to supplement their diet with solid food.

One can only wish for the publication of a book of similar quality and coverage on the cetaceans of the North Atlantic (or North Pacific). In the meantime, this exemplary book on the whales and dolphins of the southern African subregion should not be missing from the book shelves of any marine mammalogist or whale lover.

Literature Cited. Lockyer, C. A.,The age at sexual maturity of the southern fin whale (Balaenoptera physalus) using annual layer counts in the ear plug, J.

Cons. Cons. Int. Explor. Mer 34(2)– Google Scholar.This report on the reproduction and growth of the female sperm whale Physeter catodon is Part VII of our work on this whale in the Southeast Pacific. There were female sperm whales in our sample collected from two whaling stations in Chile and two in Peru.

Since Clarke and Paliza () have shown that they belonged to a single stock, we have worked them together.Whales are a widely distributed and diverse group of fully aquatic placental marine are an informal grouping within the infraorder Cetacea, usually excluding dolphins anddolphins and porpoises belong to the order Cetartiodactyla, which consists of even-toed closest living relatives are the hippopotamuses, having diverged about 40 million years ago.