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The Biology of the cacao pod borer, Acrocercops cramerela Sn. (Lepidoptera: Gracillariidae) with emphasis on its distribution in Davao Provinces and South Cotabato and its natural enemies / by Fe C. Bernardino

By:

Bernardino, Fe C [author]

Material type: Text

TextLanguage: English Publication details: Los Baños, Laguna : 1983. Cavite State University- Main Campus,Description: 78 pages : illustrations ; 28 cmContent type:

text

Media type:

unmediated

Carrier type:

volume

Subject(s):

DDC classification:

633.74 B44 1983

Online resources:

Click here to view thesis abstract and table of contents

Abstract: POPULATION GROWTH, MORTALITY AND RECRUITMENT PATTERNS OF THE BROWN MUSSEL, MODIOLUS METCALFEI (HANLEY), IN PANGUIL BAY, SOUTHERN PHILIPPINES ABSTRACT An assessment of stock of Modiolus metcalfei (Hanley) was conducted in Panguil Bay, Southern Philippines, to determine population growth parameters of the species and the status of the fishery given the current harvesting efforts of this resource in the bay. Growth parameters of the VBGF from the three selected sites were as follows: K = 1.83 yr! and L. 61.67 mm. Growth in shell length and dry weight of brown mussel populations monitored in their natural beds showed faster rates in mussel bed areas with lesser density levels. Recruitment appeared to be bimodal in two sampling stations with one major and another minor peak occurring within a year. The occurrence of the major peaks of spat settlement based on the length frequency data appeared to be variable in the three sampling areas established in the study. Catch curve analyses showed variability of total mortality (Z) values ranging from 4.69 - 7.64 yr’ for the three stations. Exploitation rates of 57% to 81% of total mortality were attributed to intensive mussel gathering by local fishermen. Fishing mortalities and rates of exploitation showed an over-exploited resource that necessitates some management intervention in order to maintain its sustainability.

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Holdings ( 1 )
Title notes ( 4 )

Holdings
Item type	Current library	Collection	Call number	Materials specified	URL	Status	Notes	Date due	Barcode
Theses / Manuscripts	Ladislao N. Diwa Memorial Library Theses Section	Non-fiction	633.74 B44 1983 (Browse shelf(Opens below))		Link to resource	Room use only	T-1579		00002401

Thesis (M.S. - - Entomology) University of the Philippines, College, Laguna.

Includes bibliographical references.

POPULATION GROWTH, MORTALITY AND RECRUITMENT PATTERNS OF THE BROWN MUSSEL, MODIOLUS METCALFEI (HANLEY), IN PANGUIL BAY, SOUTHERN PHILIPPINES

ABSTRACT

An assessment of stock of Modiolus metcalfei (Hanley) was conducted in Panguil Bay, Southern Philippines, to determine population growth parameters of the species and the status of the fishery given the current harvesting efforts of this resource in the bay. Growth parameters of the VBGF from the three selected sites were as follows: K = 1.83 yr! and L. 61.67 mm. Growth in shell length and dry weight of brown mussel populations monitored in their natural beds showed faster rates in mussel bed areas with lesser density levels. Recruitment appeared to be bimodal in two sampling stations with one major and another minor peak occurring within a year. The occurrence of the major peaks of spat settlement based on the length frequency data appeared to be variable in the three sampling areas established in the study.

Catch curve analyses showed variability of total mortality (Z) values ranging from 4.69 - 7.64 yr’ for the three stations. Exploitation rates of 57% to 81% of total mortality were attributed to intensive mussel gathering by local fishermen. Fishing mortalities and rates of exploitation showed an over-exploited resource that necessitates some management intervention in order to maintain its sustainability.

Submitted to the University Library 10/26/1993 T-1579