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Research Detail

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Joyanta Bir*
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Md. Rashedul Islam
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Md. Saifuddin Shah
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Shikder Saiful Islam
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Wasim Sabbir
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

In order to estimate the fecundity, reproductive character and feeding habit of Liza parsia, 75 gravid females were collected from Pasur River and different shrimp farms of Khulna district. The equation for the total length-body weight and standard length-body weight relationship of the species were found to be BW = 9.769 x TL - 101.4 (R² = 0.883) and BW = 9.921 x SL - 77.19 (R² = 0.865) respectively. The condition factor ranged from 10.12-15.05 having mean value of 12.35+1.08. Fecundity of Liza parsia ranged from 56541 to 188860 and the mean fecundity was calculated as 122999±30035. Total weight of the gonad varied from 5.41 to 18.41 g where the left lobe of the ovary varied from 2.78 to 9.57 g and the right lobe varied from 2.63 to 9.25 g. The mean weight of the right lobe of the gonad was 5.942±1.409 g where the mean weight of the left lobe was 5.589±1.381 g and the mean weight of gonad was 11.532±2.773 g. The regression equation for fecundity with total length, standard length, body weight and gonad weight was estimated as F= -176359+16034.5 x TL (R2=0.60), F= -132956+16059.9 x SL (R2=0.57), F= - 5595.3+1588.79 x TL (R2=0.63), F= 9048.16+9881.27 x GW (R2=0.83) respectively. The regression equation for total length, standard length and body weight with the gonad weight was estimated as GW= - 19.154+1.64 x TL (R2=0.74) and GW= -1.78+0.16 x BW (R2=0.80) respectively. The GSI values obtained in the present study varied between 7.90 to 17.61 with mean value of 14.20+1.65. The stomach contents were algae, diatoms, desmids, plant materials, annelids, crustacean, bivalves, fishes, detritus and sand grains. Food items indicated that they are omnivorous in its feeding habits.

  Liza parsia, Fecundity, Gonado-somatic index, Condition factor, Food and feeding habit
  Fisheries and Marine Resource Technology Discipline, Khulna University
  
  
  Animal Health and Management
  Goldfish

Several studies have been carried out on mullet biology with brief accounts on fecundity, GSI, reproductive characteristics and spawning (Cherif et al., 2007). But so far, very few works have been done on the fecundity and GSI of L. parsia because of which it is difficult to assess reproductive potential and induced breeding of L. parsia. In view of this fact the present study was undertaken to determine fecundity, food and feeding habit, gonadosomatic index, conditioning factor and length weight relationship of gold spot mullet Liza parsia. 

A total of 75 male and female Liza parsia were examined to determine the gonadosomatic index, fecundity and Length- Weight relationship. To analyses feeding habit to match contents of specimens thirty of L. parsia were analyzed in microbiology laboratory. The total length (TL), standard length (SL) and body weight (BW) of the specimens were measured in centimeter (cm). Body weight was recorded by electric balance (OHAUS, 0.0001g-210g) of 0.001 gram (gm) denomination. Eye observation and common morphological symptoms like swollen abdomen and protruded anus was used for identifying the maturity stages. For feeding habit analysis live fish was collected from the Pashur River and shrimp farms.

The weight of ovaries was taken by electronic balance. Weights of both left and right lobes of ovaries ware taken in the same way. Then sample weight was taken from all parts of ovaries from each lobe. Finally the number of eggs was directly counted with a fine needle.

The weight of ovaries was taken by electronic balance. Weights of both left and right lobes of ovaries ware taken in the same way. Then sample weight was taken from all parts of ovaries from each lobe. Finally the number of eggs was directly counted with a fine needle.

F = N x Gonad weight (g) / Sample gonad weight (g)

Where, F is the fecundity and N is the number of eggs in the specimens

Gonadosomatic index: Gonadosomatic Index was calculated by the formula used by Parameswarn et al. (1974) as follows 

GSI = W1 (g) / W2 (g) x 100

Where, W1= Wet weight of gonad and W2= Total Wet weight of gonad

Food and feeding habit: Fishes under study were dissected and the stomachs were carefully cut from the rest of the digestive tract. The condition of feed was assessed by the degree of distension of the stomach and expressed as gorged, full, 3/4 full, 1/2 full, 1/4 full, tress and empty. This is known as index of fullness. The volume of stomach content estimated by observation was recorded on absolute scale. The largest volume found in the preliminary study was allocated 100 points, and each of the stomachs as examined was then rated in one of the following categories 0, 3, 6, 12, 25, 50 and 100 points, according to the volume of food present. The stomach contents were emptied into a Petri dish and examined under a binocular microscope with the help of Sedgewick Rafter Counting Cell Slide. Occurrence method was used for the qualitative analysis of food contents. 

Length- weight relationship: Then length- weight relationship was calculated by using LeCren’s (1951) formula, as follows:

W = aLb 

Where W= weight in g, L= length in cm, a= intercept and b= exponent

The exponential form of relationship in the formula was expressed in the logarithmic form

LogW = Loga + bLogL

In order to derive the arithmetic relationship between fecundity-total length, fecundity-standard length, fecundity-body weight and fecundity-gonad weight, the values of regression co-efficient was estimated by the least square method (Le Cren, l95l) and the co-efficient of correlation was also calculated.

  Khulna University Studies Volume 11 (1&2) and 12(1&2): December 2013
  
Funding Source:
1.   Budget:  
  

Fish production in Bangladesh is increasing day by day because of extension of inland culture fisheries but the amount of capture from the natural water bodies is declining because of overharvesting and lack of proper biological knowledge of different fish stocks. Liza parsia is abundant in natural coastal water bodies and its culture is fully dependent on the natural fry source. So study of its detail biology was undertaken which will provide some basic information on the biology of this species. The major limitation of the present study was small sample size and data were collected for only three months so the differences in the GSI value during different months were not observed. Therefore, further year round study is needed. Some of the fish in the present investigation was not fully matured and the fecundity also varied within species of same length and same body weight.

  Journal
  


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