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Fecundity of Liza Parsia (hamilton) and Relationship Between Length-weight and Fecundity

Zubaer Bin Mostafa
Fisheries and Marine Resource Technology Discipline, Khulna University

Md. Rezaul Haque*
Fisheries and Marine Resource Technology Discipline, Khulna University

Dalia Afsana
Fisheries and Marine Resource Technology Discipline, Khulna University

A.M. Hasnein Bin Tareque
Fisheries and Marine Resource Technology Discipline, Khulna University

Abstract/ Executive Summary:

The fecundity of Liza parsia (Hamilton) was estimated studying 80 gravid females collected from the local markets in Khulna during November 2007 to January 2008. The fecundity ranged from 37,675 (total length 15.5 cm, body weight 39.791 g and ovary weight 3.532 g) to 1,87,442 (total length 21.8 cm, body weight 118.8 g and ovary weight 18.421 g). The mean fecundity was calculated to be 91269.29±35501.09. The mean weight of the ovary was 8.657±3.458 g while that of left and right lobes were 4.467±1.823 g and 4.192±1.667 g respectively. The diameter of the eggs of left lobe ranged from 0.42-0.72 mm while that of the egg from right lobe was 0.42- 0.75 mm. The regression equation for total length and fecundity, standard length and fecundity, body weight and fecundity, ovary weight and fecundity was estimated to be F = -237097.61+18214.78×TL (R2=0.69), F = -238969.73+ 22049.01×SL (R2=0.69), F = -12797.2 +1538.98 × BW (R2=0.76) and F = 6932.86 + 9742.08× OW (R2=0.90), respectively while that for total length and ovary weight, standard length and ovary weight, body weight and ovary weight was OW = −24.65 +1.85×TL (R2=0.74), OW = −25.03+ 2.25×SL (R2=0.75) and OW = −1.93+ 0.16×BW (R2=0.83), respectively. The linear relationship was highly significant in all the above cases.

Keywords: Fecundity, Length-weight, Liza parsia, Parse

Location: Different local markets in Khulna district.

Start Date: 00-11-2007

End Date: 00-01-2008

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

Fecundity of fishes varies from species to species, also within the same species due to different factors such as age, size, body and gonad weight, ecological conditions of the water body, etc. (Saifullah et al., 2004). Variation in fecundity is primarily a reflection of variation in the size of the fish at maturity. Considering the economic importance, an investigation on the fecundity of L. parsia was undertaken.

Methodology:

Sample collection: Eighty berried females of L. parsia were collected fortnightly over a period of three months from November 2007 to January 2008 from different local markets in Khulna district. The species was identified following Talwar and Jhingran (1991). On each sampling occasion 10 to 15 mature females were collected randomly. Ocular observation and common experience were used in identifying matured fish. The collected samples were then brought to the Biological Laboratory of Fisheries and Marine Resource Technology Discipline, Khulna University for detail studies.

Laboratory measurements: Total length (TL) from anterior tip of the snout to the posterior end of the tail and standard length (SL) from anterior tip of the snout to the base of the caudal fin were measured to the nearest 0.1 cm. Body weight (BW) was taken by an electric balance of 0.001 g accuracy. Before taking the body weight the fish was washed thoroughly with tap water and wiped dry with a piece of cloth. Ovaries from each of the fishes were removed by opening the abdomen. Ovaries were washed and cleaned with distilled water. Excess moisture from surface of the ovaries was removed with blotting paper before weighing. Ovaries were weighed with an electric balance of 0.001 g accuracy. The two lobes were also weighed separately. Diameter of the eggs was measured in mm under a compound electric microscope. Eggs taken from anterior, middle and posterior parts of each of the lobes were selected randomly and measured. The diameter of the eggs was measured along the longer axis by moving the eggs with a fine needle when necessary.

Fecundity estimation: Gravimetric method was applied in the present study. From each of the ovary six cross-sectional samples from the anterior, central and posterior regions of the two lobes were weighed individually and the total eggs in each of the six samples were counted with a colony counter and a needle. The total number of eggs for each fish was calculated from the sample mean and the total weight of the ovary. Fecundity values presented here are the total number of eggs from both the lobes. The number of eggs of each sample was multiplied by the total weight of the lobes of ovaries as follows:

F = (N x Ovary weight) / Sample weight (Dewan and Doha,1979 and Shafi .,1979)

Where F is the fecundity and N is the number of eggs in the sample

Condition factor estimation: The condition factor (K) was calculated by using the following formula:

K = (W x 10³ ) / L³ (King, 1997)

Where, W = weight of the fish in g; L = length of fish in cm; K = condition factor and 10³= the factor bringing the ponderal index or condition factor near unity.

Source of Information: Khulna University Studies, 9(1): 65-70, 2008

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The major limitation of the present study was small sample size and data were collected for only three months so, variation in the value of gonadosomatic index during different months could not be observed. Moreover, some of the fish samples used in the present investigation were not fully mature and related environmental parameters were not studied. Therefore, round the year systematic study for at least three consecutive years is recommended in different aqua-ecological regions to arrive to a conclusion.

Knowledge Management: Journal