A preliminary study on the reproductIve biology of two commercially important fish species: Puntius tumba and Anabas testudineus from Lake Lanao, Lanao del Sur

Date of Publication

2014

Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Biology

College

College of Science

Department/Unit

Biology

Thesis Adviser

Glicera B. Ramos

Abstract/Summary

Studying the reproductive biology of any fish species would greatly help in the successful propagation and continuation of its culture. To date, there is no detailed study performed on the reproductive biology of these Puntius tumba and Anabas testudineus. Therefore, this study would provide a reproductive biological information for these freshwater fish species. The sex ratio, Gonadosomatic Index (GSI) and absolute fecundity of the fish samples collected from Lake Lanao were studied within February 2013 to January 2014. Monthly variations in sex ratio has been studied and analyzed after counting the total number of two sexes in the monthly collected samples. Gonadal tissue samples were obtained and were then processed for histology, of which a microscopic classification for the degree of oocyte maturation was established and was used to measure the absolute fecundity. Results showed a female-favored population for both species except during the month of July for P. tumba and during November and January for A. testudineus. The abundance of females for most times of the year may indicate possible sustenance of the population. However, the number of males can also affect the fertilization success of the released oocyte. Hence, it can be speculated that equity in the female to male ratio could suggest a more efficient control of the population size. Five maturity stages were also determined for both species which include immature, maturing, mature, ripe and spent depending on the microscopic appearances of the oocytes such as the oocyte size, shape, color, and the presence of nucleus and yolk. The highest peaks in the values of both GSI and estimated absolute fecundity of representative samples of P. tumba and A. testudineus during the months of May to August, and November, March and April, respectively may be suggestive of the possible periods of spawning. These months are followed by the plausible period for breeding season, September to January for P. tumba and October-November and January-February for A. testudineus. The increasing trend from October-June for P. tumba and from October-November and January-March for A. testudineus can be indicative of the breeding-to-maturation process. As observed from the data obtained, an increasing value of GSI may connote a corresponding increase in fecundity. However, no significant relationship was observed in comparison between GSI and body length, GSI and gonad length, fecundity and body length, and fecundity and gonad length. The predicted seasonality of the fish species suggest possible periods best suited for catching the fish species. The breeding season established would therefore be the period best to catch fish while it is highly suggested to avoid catching them during their established spawning season.

Abstract Format

html

Language

English

Format

Electronic

Accession Number

CDTU021075

Shelf Location

Archives, The Learning Commons, 12F, Henry Sy Sr. Hall

Physical Description

1 computer disc ; 4 3/4 in.

Keywords

Cyprinidae—Philippines—Lake Lanao—Reproduction; Anabantidae—Philippines—Lake Lanao—Reproduction

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Embargo Period

5-3-2021

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