Author: Frank Walter Weymouth
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 688
Book Description
Commercially the Pismo clam (Tivela stultorum)ranks first in importance in California among the clams and third among all the mollusks, being exceeded only by the oyster and the abalone. A second reason for considering this species is that there has been such evidence of depletion as to lead to increasingly more stringent protective laws, all of which have been urged by the residents of the county in which the clam is most abundant. ... An accurate study of the cause and extent of this apparent diminution must await knowledge of at least the fundamental facts of the life history of this clam. ... The more important features are considered to be: the habits, enemies and mortality of the adult; the rate of growth and the factors affecting it; the age at certain significant periods, particularly at sexual maturity and at the time when the legal size is reached; the most common age of clams forming the commercial catch; the season of spawning and the productivity; and the habits, enemies and mortality of the young.
The Life-history and Growth of the Pismo Clam
Author: Frank Walter Weymouth
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 688
Book Description
Commercially the Pismo clam (Tivela stultorum)ranks first in importance in California among the clams and third among all the mollusks, being exceeded only by the oyster and the abalone. A second reason for considering this species is that there has been such evidence of depletion as to lead to increasingly more stringent protective laws, all of which have been urged by the residents of the county in which the clam is most abundant. ... An accurate study of the cause and extent of this apparent diminution must await knowledge of at least the fundamental facts of the life history of this clam. ... The more important features are considered to be: the habits, enemies and mortality of the adult; the rate of growth and the factors affecting it; the age at certain significant periods, particularly at sexual maturity and at the time when the legal size is reached; the most common age of clams forming the commercial catch; the season of spawning and the productivity; and the habits, enemies and mortality of the young.
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 688
Book Description
Commercially the Pismo clam (Tivela stultorum)ranks first in importance in California among the clams and third among all the mollusks, being exceeded only by the oyster and the abalone. A second reason for considering this species is that there has been such evidence of depletion as to lead to increasingly more stringent protective laws, all of which have been urged by the residents of the county in which the clam is most abundant. ... An accurate study of the cause and extent of this apparent diminution must await knowledge of at least the fundamental facts of the life history of this clam. ... The more important features are considered to be: the habits, enemies and mortality of the adult; the rate of growth and the factors affecting it; the age at certain significant periods, particularly at sexual maturity and at the time when the legal size is reached; the most common age of clams forming the commercial catch; the season of spawning and the productivity; and the habits, enemies and mortality of the young.
The Pismo Clam
Author: John E. Fitch
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 30
Book Description
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 30
Book Description
The Pismo Clam
Author: John E. Fitch
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 22
Book Description
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 22
Book Description
Effects of Engineering Activities on the Ecology of Pismo Clams
Author: James Willard Nybakken
Publisher:
ISBN:
Category : Clam fisheries
Languages : en
Pages : 74
Book Description
Publisher:
ISBN:
Category : Clam fisheries
Languages : en
Pages : 74
Book Description
The Pismo Clam
Author: William C. Herrington
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 80
Book Description
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 80
Book Description
Species Profiles
Author: William N. Shaw
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 24
Book Description
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 24
Book Description
Species Profiles
Author: William N. Shaw
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 26
Book Description
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 26
Book Description
The Life-history and Growth of the Pismo Clam (Tivela Stultorum Mawe), &c
Author: Frank Walter Weymouth
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 120
Book Description
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 120
Book Description
The Life-History and Growth of the Pismo Clam
Author: Frank Walter Weymouth
Publisher:
ISBN:
Category :
Languages : en
Pages : 120
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 120
Book Description
Pismo Clam
Author: William N. Shaw
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 12
Book Description
Publisher:
ISBN:
Category : Clams
Languages : en
Pages : 12
Book Description