The length-weight relationship of clupeid fish from Iran was studied by Dizaj et al. The length-weight relationship of Tenualosa ilisha on a seasonal basis was studied by Bhakta et al. A study on the length-weight relationship of Hilsha Shad, Tenualosa ilisha was conducted by Machrizal et al .
The result showed that the length-weight relationship was negatively allometric, i.e. The b value was less than 3 and the growth pattern was closely related to light penetration. The calculated length-weight ratio for combined sexes indicated negative allometric growth of the species. 2005) investigated the length-weight relationship of Tenualosa ilisha in Bangladesh waters. The result of the length-weight relationship revealed positive allometric growth for male, female and pooled data.
The length-weight relationship revealed negative allometric growth for both male and female coastal fish. This study showed that the species growth model was negatively allometric, while the analysis of
CHAPTER THREE
MATERIALS AND METHODS
- Sampling period and sampling frequency: The sampling of fish was carried out for a period of one year from February 2019 to January 2020 by regular visits to the
- Collection of fish samples: The fish specimens were collected by following
- Laboratory analysis: All the collected fish specimens were analyzed in fresh condition immediately after arriving at the laboratory. At first the total length and
- Meristic counts: The six meristic characteristics of each specimen were counted by setting up the characters against incoming light direction in the room with the help
- Apparent body characteristics: Two apparent body characteristics such as scale type and mouth pattern were taken into consideration for the study
- Species identification: By using phenotypic characters and meristic formula, the fish species were identified according to the reference books
- Data collection and record: The collected weight, morphometric measurements, meristic counts and apparent body characteristics of each specimen
- Preservation: All the identified species were preserved at room temperature in the Oceanography laboratory of Chattogram Veterinary and Animal Sciences
Total length (TL): Distance from the tip of the mouth to the end point of the caudal fin. Standard length (SL): Distance from the tip of the mouth to the base of the tail fin. Forked Length (FL): Distance from the tip of the mouth to the bifurcation point of the caudal fin.
Head length (HL): The distance from the tip of the mouth to the posterior end of the operculum. Pre-dorsal length: The distance from the tip of the mouth to the beginning of the dorsal fin. Pre-pectoral length: the distance from the tip of the mouth to the origin of the pectoral fin.
Pre-pelvic length: Distance from the tip of the mouth to the origin of the pelvic fin. Pre-anal length: Distance from the tip of the mouth to the origin of the anal fin.
CHAPTER FOUR RESULT
Monthly species availability
Through the analysis of meristic scores, it was observed that each meristic character of a species remained within a certain range and range did not vary with the size and growth of fish and also with the different months and sampling stations.
Analysis of morphometric traits
- Descriptive statistics
- Station wise variation: The variation of morphometric characters of the species between stations was represented in the Figure 23. Using the average morphometric
- Principal component analysis
The analysis of morphometric measurements of Sardinella longiceps indicated that the range of total length and fork length was cm and cm, respectively. The mean value of pre-orbital length, pre-dorsal length, pre-pectoral length, pre-ventral length and pre-anal length was. The morphometric measurements were expressed as the percentage of total length in the following figure 22(a-f).
For all specimens, the cleft length had the highest percentage, and the preorbital length had the lowest. The preorbital length of Escualosa thoracata was reported as 4.15% of the total length, which was the lowest percentage. Out of ten morphometric characters, 9 characters showed a high positive correlation, only the preorbital length showed a low value of the correlation coefficient.
The correlation coefficient value was negative between pre-orbital length and body depth, namely – 0.314. According to the correlation coefficient value, there was no correlation between pre-orbital length and pre-dorsal length. Table 7, which shows the correlation between the morphometric measurements of Anodontostoma chacunda, revealed that all measurements were significantly correlated except for the pre-orbital length.
According to the figure, the pre-orbital length of all species was approximately equal, whatever the other lengths were small or large. The total length of this species was greater in station 1 than station 3, but the body depth, pre-orbital length and pre-anal length of station 3 were greater than station 1. 36 0. The group of station 1 was characterized by high values for pre-ventral length, Pre-orbital length and head length.
Correlation was found between pre-orbital length, head length and pre-pectoral length and also between pre-dorsal length, head length and body depth. A strong correlation was found between body depth and pre-dorsal length, between pre-orbital length, head length and pre-anal length, between pre-anal length and pre-pectoral length and between pre-orbital length, depth of body and head length. Large pre-dorsal and pre-ventral length characterized the group of station 2 and station 3 was characterized by high value of body depth, pre-orbital length and head length.
The analysis found similarities between the morphometric characters of the three sampling stations (Figure 32). Using the pooled length and body weight data for species, the length-weight relationship was established for each species.
CHAPTER FIVE DISCUSSION
- Species availability
- Analysis of meristic traits
- Descriptive statistics of the morphometric traits
- In percentage of total body length
- Correlation between the morphometric traits
- Month and station wise variation in morphometric traits
- Cluster analysis
- Length-weight relationship
Biometric analysis of Sardinella longiceps from Ratnagiri coast of Maharastra by Shah et al. The same values were calculated by Ara et al. 2019) and Abeed, Ismaeel and Khatan (2012) for the morphometric and meristic analysis of Tenulosa ilisha. Descriptive statistics were also followed by Shah et al. 2014) for biometric analysis of Sardinella longiceps.
By comparing the mean values of the morphometric measurements between the sampling stations, an exception was found in the case of Hilsa Kelee. The same graphical presentation was done by Olopade et al. 2018) to compare the morphometric measurements of Coptodon guineensis at two different locations. The present study suggested that due to all these reasons, the morphometric characteristics of the fish species varied by month.
Since the sampling stations were part of the same coastal region, similarities were found in the morphometric characters of the fish species collected from the stations. From the length-weight relationship, the value of the ―b‖ parameter was determined for each type of fish that showed the growth pattern of the species. According to Ahmed et al. 2018) growth pattern of Tenualosa ilisha was allometrically positive in the Bay of Bengal.
In this study, Escualosa thoracata had a 'b' value of 2.73, indicating a negative allometric growth of the species in the study area. The growth pattern of male and female Escualosa thoracata was determined to be positively allometric in Kerala, India (Abdussamad et al., 2018). In terms of length-to-weight ratio, Sardinella fimbriata from Chattogram coastal region had isometric growth as the "b" value of the species was 3.
According to the length-weight relationship graph, the parameter b=2.45 for Sardinella longiceps indicates negative allometric growth of the species in the coastal region. Similar species growth pattern was found in Ratnagiri coast of Maharastra, India and in coastal Baluchistan, Pakistan by Shah et al. Differences in habitat and also in environment can cause differences in the growth pattern of the same species.
CHAPTER SIX CONCLUSION
CHAPTER SEVEN
RECOMMENDATION AND FURTHER PERSPECTIVE
Morphometrics and meristics of Young Hilsa Shad Tenualosa ilisha (Hamlton-Buchanan, 1822) in Shatt Al-Arab River. Landmark-based morphometric and meristic analysis in response to the characterization of the wild Bhagna, Labeo ariza populations for its conservation. Age analysis and growth patterns of Tenualosa ilisha using otolith examination and length-weight relationships from different regions of Bangladesh.
Morphometric and meristic characters of Selangat fish (Anodontostoma sp.) from Kelabat Bay Tukak Strait, Bangka Belitung. Estimation of size frequency distribution, sex ratio and length-weight relationship of Hilsa (Tenualosa ilisha) in Bangladesh waters. Differentiation of intraspecific phenotypic plasticity of elongated glassy perchlet, Chanda nama: insights into landmark-based cluster morphometric and.
Morphometric and meristic study of Gudusia chapra (Ham. 1822) and Gonialosa manmina (Ham. 1822) (Clupeidae) from Kaptai Lake, Bangladesh. Seasonal length-weight relationship and relative condition factor of Tenualosa ilisha (Hamilton, 1822) in the Narmada Estuary, Gujarat, India. Morphometric characters and merit counts of a fish, Crossocheilus latius latius (Hamilton-Buchanan) from Ranjit Sagar Wetlands, India.
Monument-based morphometric and meristic variations in two related hilsha populations, Tenualosa ilisha and Tenualosa, toil from water bodies in Bangladesh. Length-weight relationship and GSI of hilsa, Tenualosa ilisha (hamilton, 1822) fishing in the Meghna River, Bangladesh. Characterization of morphological and meristic traits and their variations between two different populations (wild and farmed) of Cichlasoma festae, a species native to tropical Ecuadorian rivers.
Morphometry and meristics of juvenile Hilsa Shad Tenualosa ilisha (Hamlton-Buchanan, 1822) in the Shatt Al-Arab River. Distribution and length-weight relationship of Hilsa shad Tenualosa ilisha in Bilah River, Labuhanbatu Regency, North Sumatera Province, Indonesia. Morphometric and meristic differences between two Palla species, Tenualosa ilisha (Hamilton) from the Indus River, Pakistan.
Observations on the morphometric and meristic characters of Guinean tilapia, Coptodon guineensis (Günther, 1892) (family: Cichlidae) from Buguma Creek and New Calabar River in Nigeria. Appendix A (IV): Result of the Kolmogorov-Smirnov test with one sample for different morphometric measurements of Sardinella longiceps.
