• BMB Reports
• /
• 제36권5호
• /
• pp.462-467
• /
• 2003

The Random Amplified Polymorphic DNA-Polymerase Chain Reaction (RAPD-PCR) was applied to analyze the genetic variation of the Hilsa shad, Tenualosa ilisha Ham., from the two major inland rivers (Padma and Meghna) in Bangladesh. Twenty-eight random 10-mer primers were primarily scored in 8 individuals from each of the two locations. Fifteen primers, which gave polymorphism, were selected and used in the final analysis of 34 individuals from the two sites. Using these primers, 480 scorable DNA fragments were found, of which 98 (20.41%) were polymorphic. By comparing the RAPD banding patterns, variations were found between and within the populations. A dendrogram was constructed with the polymorphic fragments to analyze the genetic distances between the Hilsa shad populations. The results show two major clusters of Padma and Meghna, assuming different spawning populations with different stocks or races of Hilsa shad in the major Bangladesh rivers.

• Fisheries and Aquatic Sciences
• /
• 제11권2호
• /
• pp.98-102
• /
• 2008

Relationships between total length (TL) and fecundity, body weight and fecundity, ovary length and fecundity, and ovary weight and fecundity of hilsa shad, Tenualosa ilisha Hamilton, collected from Kuakata, Patuakhali, Bangladesh, were studied. During the sampling period, the fecundity of hilsa was found to range from 169,000 (fish TL=28.0cm, weight=250g) to 1,088,000 (fish TL=40.5cm, weight=955g) with a mean of $520{\pm}53{\times}1,000$. The number of eggs per gram of ovary for samples collected from the anterior, middle, and posterior regions of the ovary were also recorded, but no significant variation was found among ovary regions at the 5% level of significance. Fecundity increased with fish TL and weight. The regression equations obtained in arithmetic forms of relationships between TL and fecundity (F), body weight (BW) and fecundity, ovary length (OL) and fecundity, and ovary weight (OW) and fecundity were $F=-887,896+40,511{\times}TL(r=0.85)$, $F=67,577+755.44{\times}BW(r=0.85)$, $F=-562,070+87,668{\times}OL(r=0.75)$ and $F=124,815+6,596.7{\times}OW (r=0.84)$, respectively. The relationships between fecundity and TL, body weight, ovary length, and ovary weight were linear, and the 'r' values were highly significant (p<0.01). These results provide valuable data for the restoration of hilsa resources, which are economically important but have shown reduced productivity in nations adjacent to the Bay of Bengal.

• 한국어류학회지
• /
• 제10권1호
• /
• pp.49-60
• /
• 1998

한국산 청어과(科) 어류에 대한 분류학적인 재검토를 실시하기 위하여 우리나라 연안 22개 지점에서 채집하거나 국외에서 입수한 표본에 대한 계수 계측형질을 중심으로 연구를 수행하였다. 본 조사결과, 한국산 청어과(科)는 10속(屬) 11종(種)으로 확인되었다. Pristigaster 속(屬) 어류는 남미의 담수역에서만 분포 서식하며, 배지느러미가 없는 특정을 지니고 있어 Chyung (1977)이 보고한 때치 Pristigaster chinensis는 준치의 동종이명으로 확인되었다. 청어과(科) 어류의 학명을 재검토한 결과, 눈퉁멸의 학명은 Etrumeus micropus에서 E. teres (De Kay, 1842)로, 샛줄멸은 Spratelloides japonicus에서 S. gracilis (Temminck et Schlegel, 1846), 이와치는 Sardinella immaculata에서 S. jussieu (Valenciennes, 1847)로， 밴댕이는 Harengula zunasi 에서 Sardinella zunasi (Bleeker, 1854) 및 납작전어는 Macrura reevesii에서 Tenualosa reevesii (Richardson, 1846)로 확인되어, 이들의 학명을 변경하였다. 청어과(科) 어류는 우리나라 전해역에서 고르게 출현하였으며, 비교적 전 해역에서 고르게 출현하는 종은 전어 Konosirus punctatus와 밴댕이 Sardinella zunasis로 확인되었고, 한국산 고유종은 없었다.

• 농업과학연구
• /
• 제45권2호
• /
• pp.258-264
• /
• 2018

A study was performed to analyze the biochemical composition (moisture, protein, fat, ash, salt value, iron, calcium and phosphorus) of raw and salted hilsa. Pure (with less than 1% impurities) and clean dry salt was used (fish weight : salt weight = 3 : 1) for salting the hilsa. The nutrients values of the hilsa from two different regions were significantly (p < 0.05) varied. The biochemical compositions were also different before and after the processing of the hilsa. Riverine hilsa contains relatively more moisture ($57.79{\pm}0.51%$) and protein ($15.65{\pm}0.50%$) than marine hilsa. Fat ($16.39{\pm}0.51%$) and salt ($1.80{\pm}0.14%$) contents are higher in marine hilsa; whereas the ash ($7.88{\pm}0.35%$) content was higher in the riverine hilsa. Minerals like iron ($4.92{\pm}0.32mg/100g$) and calcium ($480.02{\pm}6.73mg/100g$) remain in large amounts in the marine hilsa, but the phosphorus ($112.36{\pm}4.40mg/100g$) content remains at a high level in the riverine hilsa. In addition, the protein (raw condition, $18.54{\pm}0.46%$, riverine; $17.12{\pm}0.42%$, marine and salted condition, $32.54{\pm}0.5%$, riverine; $27.31{\pm}0.48%$, marine) and fat (raw condition, $15.41{\pm}0.46%$, riverine; $19.07{\pm}0.51%$, marine and salted condition, $11.58{\pm}0.39%$, riverine; $13.6{\pm}0.55%$, marine) contents were higher in the abdominal region of the riverine and marine hilsa both in the raw and salted conditions than in the head and caudal region.