Biological aspects of juvenile great hammerhead sharks Sphyrna mokarran from the Arabian Gulf

2021 ◽  
Vol 72 (1) ◽  
pp. 110
Author(s):  
Hua Hsun Hsu ◽  
Zahid Muhammed Nazeer ◽  
Yu Jia Lin ◽  
Premlal Panickan ◽  
Khaled Al-Abdulkader ◽  
...  
Keyword(s):  
Life History ◽  
Arabian Gulf ◽  
Age Groups ◽  
Western Indian Ocean ◽  
Growth Function ◽  
The North ◽  
Von Bertalanffy Growth Function ◽  
Growth History ◽  
History Of ◽  
Hammerhead Sharks

The life history of the critically endangered great hammerhead Sphyrna mokarran was examined using samples collected from commercial fisheries operating in Saudi Arabian waters of the Arabian Gulf. In all, 105 specimens (47 males, 58 females), with a total length (TL) ranging from 67.0 to 236.0cm, were examined between April 2016 and November 2019. All individuals were immature. A neonate measuring 67.0cm TL caught in early June suggested the parturition period of this species was during May and June. Vertebrae under the first dorsal fin from 69 individuals (30 males, 39 females) were processed. Three age groups, from 0+ to 2+ years old, were identified by vertebrae analysis. Based on the relationship between vertebral central diameter and TL, the Fraser–Lee approach was used to back-calculate the growth history of TL. A two-parameter von Bertalanffy growth function provided the best fit to describe early growth of great hammerheads during 0–2.9 years of age based on observed and back-calculated length-at-age data. The asymptotic lengths and k values were estimated to be 256.8cm TL and 0.449 year–1 respectively. This study provides the first life history information of great hammerhead sharks in the north-western Indian Ocean.

The Life History of Babesia bigemina in the North American Fever Tick

Science ◽  
1931 ◽  
Vol 73 (1901) ◽  
pp. 620-621
Author(s):  
Emery Westervelt Dennis
Keyword(s):  
Life History ◽  
North American ◽  
Babesia Bigemina ◽  
The North ◽  
History Of

On the blood-sucking midge Culicoides vexans Stager, including the description of its eggs and the first-stage larva

Parasitology ◽  
1953 ◽  
Vol 43 (1-2) ◽  
pp. 148-159 ◽  
Author(s):  
B. Jobling
Keyword(s):  
Life History ◽  
Royal Society ◽  
Short Communication ◽  
Tropical Medicine ◽  
Stage Larva ◽  
The North ◽  
Blood Sucking ◽  
History Of ◽  
North Western

At one of the meetings of the Royal Society of Tropical Medicine and Hygiene, I made a very short communication on the three blood-sucking midges (Jobling, 1929). My particular reference was to Culicoides vexans, which is the most troublesome and commonestspecies in spring, in the northern and the north-western suburbs of London. At that time I had been studying the life history of this midge, including the morphology of its eggs, larvae and the pupa, but this work was not completed.

An Invasion of British Guiana by Locusts in 1917, with a complete Illustrated Account of the Life-history of the Species

1919 ◽  
Vol 9 (4) ◽  
pp. 341-357 ◽  
Author(s):  
G. E. Bodkin ◽  
L. D. Cleare
Keyword(s):  
Life History ◽  
British Guiana ◽  
North West ◽  
The North ◽  
History Of

British Guiana has not been invaded by migratory locusts since the year 1886, when, as far as it is possible to ascertain from the records of those bygone days, the same species of locust was implicated. Also, on the occasion of this previous attack, it seems very probable that a swarm first infested the North West and Pomeroon areas and, multiplying there, migrated further down the coast to Berbice.

scholarly journals SOME EFFECTS OF OVARIECTOMY DURING THE PERIOD OF DECLINING REPRODUCTIVE POWERS IN MICE

1936 ◽  
Vol 63 (6) ◽  
pp. 893-900 ◽  
Author(s):  
William S. Murray
Keyword(s):  
Life History ◽  
Age Groups ◽  
Older Age ◽  
Female Mice ◽  
History Of

Cessation of breeding and castration of female mice approaching the period of declining reproductive power have at least two effects upon the subsequent life history of these animals. 1. The average expectation of life is appreciably increased. 2. The incidence of tumor is markedly decreased, especially in the older age groups.

scholarly journals Growth and reproduction of the deep-water rose shrimp, Parapenaeus longirostris (Lucas, 1846) (Decapoda, Penaeidae), in the Southern Tyrrhenian Sea

Crustaceana ◽  
2014 ◽  
Vol 87 (10) ◽  
pp. 1168-1184 ◽  
Author(s):  
Marco Arculeo ◽  
Marco Arculeo ◽  
Sabrina Lo Brutto ◽  
Marco Arculeo ◽  
Sabrina Lo Brutto ◽  
...  
Keyword(s):  
Deep Water ◽  
Growth Function ◽  
Western Coast ◽  
Tyrrhenian Sea ◽  
The North ◽  
Von Bertalanffy Growth Function ◽  
Parapenaeus Longirostris ◽  
Southern Tyrrhenian Sea ◽  
First Maturity ◽  
Two Peaks

From June 2006 to May 2007, monthly samples ofParapenaeus longirostris(Lucas, 1846) were collected on land from the landings of two different, although contiguous, fishing grounds exploited by the bottom trawl fisheries of the two fishing harbours of Terrasini and Porticello, located on the north-western coast of Sicily. Carapace length (CL) of the female and male deep-water rose shrimp in Terrasini ranged from 9 to 32 mm and 13 to 26 mm, respectively, whereas in Porticello the length ranged from 8 to 31 mm and 13 to 26 mm, respectively. The Von Bertalanffy Growth Function parameters for Terrasini females and males were CL∞ = 38.5 mm, year−1and CL∞ = 32.5 mm, year−1, respectively. For Porticello females and males, the parameters were CL∞ = 40 mm, year−1and CL∞ = 30 mm, year−1, respectively. Analysis of maturity stages indicates that the deep-water rose shrimp is an asynchronous batch of almost continuous spawners, although one to two peaks of activity can be detected. In both fishing areas, the reproductive phase peaked twice, once in January and again from August to September. The sizes at first maturity (CL50%) were 27.8 and 26.6 mm CL for Terrasini and Porticello, respectively.

Age and growth of the whale shark (Rhincodon typus) in the north-western Pacific

2014 ◽  
Vol 65 (12) ◽  
pp. 1145 ◽  
Author(s):  
Hua Hsun Hsu ◽  
Shoou Jeng Joung ◽  
Robert E. Hueter ◽  
Kwang Ming Liu
Keyword(s):  
Growth Parameters ◽  
Growth Function ◽  
Age And Growth ◽  
Whale Shark ◽  
Growth Band ◽  
Rhincodon Typus ◽  
The North ◽  
Von Bertalanffy Growth Function ◽  
Marginal Increment ◽  
Using Data

This study estimated age and growth of the largest extant fish, the whale shark (Rhincodon typus) by counting vertebral band pairs from 92 specimens comprising 43 males (2.68–9.88 m total length [TL]), 30 females (1.60–7.02 m TL), and 19 unsexed individuals (2.83–6.67 m TL) taken by Taiwanese commercial fisheries during 2001–06. Growth band pairs up to 25 and 42 were counted for a 6.38-m TL female and a 9.88-m TL male, respectively. Using marginal increment ratio and centrum edge analysis, band pairs were postulated to be formed twice a year. The two-parameter von Bertalanffy growth function provided the best fit without significant differences between sexes. Growth parameters were calculated for both sexes as L∞ = 16.80 m TL, k = 0.037 year–1; annual band pair formation would modify these parameters to L∞ = 15.34 m TL, k = 0.021 year–1. Using data reported in another study for 50% size at maturity for males (8.1 m TL), and the largest immature and smallest mature females (8.7 and 9.6 m TL, respectively) in the Indo-Pacific, these TLs converted to ages at maturity of 17 years for males and 19–22 years for females. The longevity was calculated to be 80.4 years.

Attachment of the Coral Caryophyllia Smithii S. & B. to Tubes of the Polychaete Ditrupa Arietina (Müller) and other Substrates

1976 ◽  
Vol 56 (2) ◽  
pp. 291-303 ◽  
Author(s):  
John B. Wilson
Keyword(s):  
Life History ◽  
Early Growth ◽  
Soft Sediments ◽  
Wide Range ◽  
Growth History ◽  
History Of

INTRODUCTIONLittle is known about the early growth history of solitary corals in relation to the substrates to which they are attached. An understanding of this relationship between coral and substrate, and of how it may change throughout the life of the coral, is particularly important in studies of the life history and ecology of solitary corals living in sand and other soft sediments. A knowledge of the variety of different substrates to which solitary corals are attached in the wide range of different environments in which they live is also of importance to the palaeontologist when attempting palaeoecological interpretation of transported coral debris.

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