scholarly journals A Preliminary Study on The Determination of Reproductive Biology of European Pilchard, Sardina pilchardus (Walbaum, 1792) Distributed in The Aegean Sea

2019 ◽  
Vol 7 (12) ◽  
pp. 2264
Author(s):  
Burcu Taylan ◽  
Ertan Taskavak ◽  
Sule Gurkan
Keyword(s):  
Fork Length ◽  
Aegean Sea ◽  
Sardina Pilchardus ◽  
Spawning Period ◽  
Multiple Spawning ◽  
Weight Relationship ◽  
Total Length ◽  
Reproduction Biology ◽  
Significant Difference

Sardina pilchardus is a multiple spawning fish, i.e., the species that spawns periodically during the spawning period. In order to examine the reproduction biology of the species, the specimens were obtained in the known spawning period indicated by the current literature obtained from fishers who were commercially fishing in December 2018 and January-February 2019. After the fork length and total length together with their weight measurements, the specimens were dissected in the laboratory. The adult females’ gonads were then fixed in 4% formalin solution for fecundity. A total of 170 individuals was examined and the values of their fork length, total length and weight were computed as 9.7-13.4 cm (mean: 11.16±0.81), 10.5-15 cm (mean: 12.3±0.89), 8.06-23.7 g (mean: 12.7±2.93), respectively. 44 of the supplied specimens were male (25.9%), 122 female (71.8%) and 4 (2.3%) uncertain, thus, the female: male ratio was determined as 2.77:1. According to χ2 test results, a statistically significant difference was observed among individuals. For the specimens examined, the fork length-weight relationship was calculated as W = 0.0098FL2.96, while total length-weight relationship was W = 0.0071TL2.97. In order to calculate the fecundity, sub-samples were taken from the anterior, median and posterior parts of 15 ovaries in the ration of 2 - 5% of the ovary weight and the mature oocytes were counted. As a result, the species’ fecundity was found to be between 4,600-9,800 (6,110±1,755). The relationship between total length and fecundity was computed as W= 1,640.7 TL-13,907 and a linear relationship was determined.

Ovarian atresia in the Mediterranean sardine, Sardina pilchardus sardina

2003 ◽  
Vol 83 (6) ◽  
pp. 1327-1332 ◽  
Author(s):  
K. Ganias ◽  
S. Somarakis ◽  
C. Koutsikopoulos ◽  
A. Machias ◽  
A. Theodorou
Keyword(s):  
Annual Cycle ◽  
Histological Analysis ◽  
Eastern Mediterranean ◽  
Aegean Sea ◽  
Hepatosomatic Index ◽  
Sardina Pilchardus ◽  
Spawning Period ◽  
Total Length ◽  
The Mediterranean

Histological analysis was used to describe and analyse the process of ovarian atresia in sardine (Sardina pilchardus sardina) from the central Aegean Sea (eastern Mediterranean). The spawning potential of females in relation to intensity of atresia was evaluated and the rate that the ovary passed from the active to inactive condition was followed in fish collected over an annual cycle. Early postspawning females, defined as those with 100% alpha-atretic oocytes, occurred throughout the spawning period; they had lower gonosomatic and hepatosomatic index, but similar total length compared to reproductively active females.

scholarly journals REPRODUCTION BIOLOGY OF TRUE PERCULA CLOWN FISH Amphiprion percula IN HATCHERY

2012 ◽  
Vol 4 (2) ◽  
Author(s):  
Ketut Maha Setiawati ◽  
Gunawan Gunawan ◽  
Jhon Harianto Hutapea
Keyword(s):  
Economic Value ◽  
Ornamental Fish ◽  
Hatching Rate ◽  
Spawning Period ◽  
Spawning Frequency ◽  
Amphiprion Percula ◽  
Total Length ◽  
Reproduction Biology

<p>True percula clown fish (Amphiprion percula) is one of marine ornamental fish with high economic value and can spawn throughout the year in an aquarium. The aims of this research were to understand reproduction aspects of true percula clown fish broodstock in an aquarium. A pair of broodstock used in this experiment were 4-9 cm in total length and maintained in an aquarium of 60x40x30 cm3 dimension. Numbers of brrodstock were 18 pairs and each aquarium filled with one pair of broodstock. During the experiment, fish were fed with artificial feed first and one hour later with mysids shrimp and copepod until satiation twice a day. Parameters observed were broodstock size, numbers and hatching rate of eggs. The results showed, the size of spawned female were range from 6.6-9.5 cm and male from 4.6-6.2 cm. Average of eggs produced per spawning was varied 423±255 with the average of spawning frequency was 2.78±0.38 times/month. Broodstock was spawn partially with the maximum spawning frequency of single broodstock was 4 times/month. The biggest female with size of 9.5 cm was still productive and spawn 3 times/month. There was a pair of broodstock which can produce more than 700 eggs/spawning. This results indicated that true percula clown fish can spawn throughout the year in the aquarium with varied of eggs number and spawning frequency for each individual and spawning period. The average of hatching rate during the experiment was 79.72±13.73 % with range between first to the next spawning 0f 7-14 day.</p><p>Keywords: reproduction, true percula clown fish, Amphiprion percula, hatching rate</p>

scholarly journals Ege Denizi’nde Dağılım Gösteren Echelus myrus (Linnaeus, 1758) Türünün Üreme Özelliklerinin Belirlenmesi

2021 ◽  
Vol 9 (3) ◽  
pp. 531-535
Author(s):  
Burcu Taylan ◽  
İlker Aydın
Keyword(s):  
Linear Relationship ◽  
Aegean Sea ◽  
Weight Relationship ◽  
Total Length

The present study which determined the reproduction characteristics of the painted eel Echelus myrus (Linnaeus, 1758) obtained by commercial trawlers from three different regions of Ildır Bay, Çeşme (Aegean Sea) was carried out March-April 2018. The total length-weight values were 55.5-97.0 (70.63±12.85) cm, 180.84-420.83 (276.50±70.50), respectively, and total length-weight relationship was computed as W=0.2936L1.61 (R2=0.96). Fecundity was computed as 25563-55016 (41811±9416) oocyte and a linear relationship between fecundity and total length was calculated as F=658.54L-5603.9 (R2=0.86). Oocyte diameterswere determined 0.84-1.09 mm (0.95±0.06).

Reproductive biology of the black-striped pipefish Syngnathus abaster Risso, 1827 (Pisces: Syngnathidae) in the Aegean Sea of Turkey

2018 ◽  
Vol 47 (1) ◽  
pp. 67-74 ◽  
Author(s):  
Burcu Taylan ◽  
Gozde Ekin Tatarhan ◽  
Ozlem Aksoy ◽  
Mehmet Culha
Keyword(s):  
Reproductive Biology ◽  
Average Length ◽  
Gonadosomatic Index ◽  
Aegean Sea ◽  
Brood Pouch ◽  
Surface Water Temperature ◽  
Spawning Period ◽  
Total Length ◽  
Hydrated Oocyte ◽  
Length Relationship

Abstract The paper presents the results of research on the reproductive biology of Syngnathus abaster – a species distributed in Çandarli Bay. For this purpose, seine nets were collected from a depth of 0.5–2 m in 15 minute periods between April 2013 and March 2014, and a total of 185 individuals were sampled. It has been determined that 94 individuals (50.81%) were females, 79 were males (42.70%) and 12 were immature (6.49%). The sex ratio was 1:0.84. The average length values in female, male and immature individuals were 111.5 ± 7.35, 109.9 ± 11.08 and 79.8 ± 5.30 mm, respectively. The maximum mean surface water temperature is in spring and summer seasons. When Gonadosomatic Index (GSI%) values were examined, the spawning period of the species was indicated as spring and summer. Three groups of species were identified as maturing (diameter: 0.61–1.20 mm), mature (diameter: 1.21–1.70 mm) and hydrated oocytes (diameter: 1.71–2.10 mm) in ovaries of female individuals. The number of eggs in the brood pouch of pregnant male fishes was on average 48 (mean ± SD = 48 ± 14.09 eggs, range: 23–78 eggs). The hydrated oocyte/total length relationship was: y = 0.8651x – 84.332 (n = 14, r2 = 0.64) and the number of eggs/total length relationship in the brood pouch of pregnant males was: y = 1.0168x – 67.715 (n = 33, r2=0.58).

REPRODUCTION BIOLOGY OF TRUE PERCULA CLOWN FISH Amphiprion percula IN HATCHERY

2012 ◽  
Vol 4 (2) ◽  
Author(s):  
Ketut Maha Setiawati ◽  
Gunawan Gunawan ◽  
Jhon Harianto Hutapea
Keyword(s):  
Economic Value ◽  
Ornamental Fish ◽  
Hatching Rate ◽  
Spawning Period ◽  
Spawning Frequency ◽  
Amphiprion Percula ◽  
Total Length ◽  
Reproduction Biology

True percula clown fish (Amphiprion percula) is one of marine ornamental fish with high economic value and can spawn throughout the year in an aquarium. The aims of this research were to understand reproduction aspects of true percula clown fish broodstock in an aquarium. A pair of broodstock used in this experiment were 4-9 cm in total length and maintained in an aquarium of 60x40x30 cm3 dimension. Numbers of brrodstock were 18 pairs and each aquarium filled with one pair of broodstock. During the experiment, fish were fed with artificial feed first and one hour later with mysids shrimp and copepod until satiation twice a day. Parameters observed were broodstock size, numbers and hatching rate of eggs. The results showed, the size of spawned female were range from 6.6-9.5 cm and male from 4.6-6.2 cm. Average of eggs produced per spawning was varied 423±255 with the average of spawning frequency was 2.78±0.38 times/month. Broodstock was spawn partially with the maximum spawning frequency of single broodstock was 4 times/month. The biggest female with size of 9.5 cm was still productive and spawn 3 times/month. There was a pair of broodstock which can produce more than 700 eggs/spawning. This results indicated that true percula clown fish can spawn throughout the year in the aquarium with varied of eggs number and spawning frequency for each individual and spawning period. The average of hatching rate during the experiment was 79.72±13.73 % with range between first to the next spawning 0f 7-14 day.Keywords: reproduction, true percula clown fish, Amphiprion percula, hatching rate

scholarly journals Investigating otolith mass asymmetry in six benthic and pelagic fish species (Actinopterygii) from the Gulf of Tunis

2021 ◽  
Vol 51 (2) ◽  
pp. 193-197
Author(s):  
Nawzet Bouriga ◽  
Marwa Mejri ◽  
Monia Dekhil ◽  
Safa Bejaoui ◽  
Jean-Pierre Quignard ◽  
...  
Keyword(s):  
Somatic Growth ◽  
Mean Value ◽  
Sardina Pilchardus ◽  
Benthic Species ◽  
Pelagic Species ◽  
Mass Asymmetry ◽  
Total Length ◽  
Gulf Of Tunis ◽  
Significant Difference ◽  
The Difference

Otolith mass asymmetry can significantly affect the vestibular system functionalities; usually, the X values of mass asymmetry vary between −0.2 and + 0.2 (−0.2 &lt; X &lt; + 0.2). These values can change during a fish life and therefore they are not related to the fish total length. We collected a total of 404 fish specimens from the Gulf of Tunis, including three pelagic species: Sardina pilchardus (Walbaum, 1792) (74 otolith pairs), Trachurus mediterraneus (Steindachner, 1868) (66 otolith pairs), and Chelon auratus (Risso, 1810) (60 otolith pairs) and three benthic species: Gobius niger Linnaeus, 1758 (77 otolith pairs), Mullus barbatus Linnaeus, 1758 (60 otolith pairs), and Trachinus draco Linnaeus, 1758 (67 otolith pairs). The relation between the total length and the otolith mass asymmetry was first calculated and compared, and then was evaluated. The comparison of the otolith mass asymmetry between benthic and pelagic species showed a significant difference (P &lt; 0.05), where the absolute mean value of X does not exceed the critical value (0.2) for all the studied species. No relation has been found between the magnitude of the otolith mass asymmetry and the length in both benthic and pelagic specimens. Environmental factors have an indirect effect on somatic growth and otolith accretion. The significant difference found in this study can be due to the difference between the benthic and pelagic environments.

scholarly journals Species Composition and Length-Weight Relationship of Anguillid Eels Habited in Bengkulu Waters, Indonesia

2018 ◽  
Vol 2 (2) ◽  
Author(s):  
Komang Suryati ◽  
Fauziyah Fauziyah ◽  
Ngudiantoro Ngudiantoro
Keyword(s):  
Cluster Analysis ◽  
Morphological Diversity ◽  
Morphometric Parameter ◽  
Growth Trend ◽  
Population Characteristic ◽  
Average Value ◽  
Weight Relationship ◽  
Total Length ◽  
Significant Difference ◽  
Relationship Of

Management of euryhaline species, such as Anguillid eel, is very important. Anguillid eel is an important economic fish which the partly of its life cycle spent in inland waters then migrates into the ocean for spawning. The objective of this study is to identify the morphological diversity and length-weight relationship of Anguillid eels in this province. The total of 148 individuals of elver and adult Anguillid eels were caught was identified using the comparison of ano-dorsal with total length parameter. Cluster analysis was obtained based on measurement of morphometric parameter. The current work used cluster analysis and dendrogram to group the population characteristic of Anguilla eel. It revealed that in the Jenggalu, Kungkai and Manna rivers of Bengkulu province, there are two groups of Anguilla eel with significant difference of ano-dorsal length. The value of the ano-dorsal varied from 2.56 ± 1.54 and 17.78 ± 1.33 for A.bicolor bicolor and A.marmorata, respectively. The length-weight relationships between total length (TL) and weight (W) for Anguilla bicolor and A.marmorata were found to be highly significant (r2 > 0.94, p < 0.001). The average value of 'b' for length and weight were higher than 3, i.e., 3.2677 and 3.4821 in A.bicolor and A.marmorata respectively which indicated a positive allometric growth trend of this species in the studied area.

scholarly journals Gonadal development of the holothurian Holothuria polii (Delle Chiaje, 1823) in spawning period at the Aegean Sea (Mediterranean Sea)

2019 ◽  
Vol 36 (4) ◽  
pp. 379-385
Author(s):  
Mustafa Tolga Tolon ◽  
Serhat Engin
Keyword(s):  
Gonadosomatic Index ◽  
Aegean Sea ◽  
Gonadal Development ◽  
Gonad Weight ◽  
Sea Cucumbers ◽  
Spawning Period ◽  
Development Stages ◽  
Reproduction Biology ◽  
Post Spawning ◽  
Holothuria Polii

The Mediterranean sea cucumbers including Holothuria polii has become commercially important in international trade due to the high demand of consumers from Far East countries. Sea cucumbers fisheries is a valuable income for the regional fishermen but natural stocks endangered by overfishing in recent years. Fisheries regulations and aquaculture studies are important precautions for preserving natural stocks. All these efforts are based on reproduction biology of this species which slightly differed among regions. In this study, the reproduction biology including morphological characteristics, gonadosomatic index and gonadal development stages of H.polii at the eastern coast of Aegean Sea (Izmir, Turkey) were investigated during the reproduction (spawning) period from July to October 2018. Gonads and gonad sections of 60 sea cucumbers (120.60 ± 19.56 g) have been observed by macroscopic and microscopic inspections. Three gonadal development stages have been identified by histologic observations as mature (III), spawning (IV) and post-spawning stage (V) in gonadal tubules. Results indicate that both female and male gonads are at mature and spawning stage in July and all gonads are at post-spawning stage in October. The mean gonad weight was 12.53 ± 1.33 g at the beginning of the spawning period (July) and 1.87 ± 0.58 g at the end of the spawning period (October). Gonadosomatic index decreased from 17.53 ± 0.02% (July) to 3.37 ± 0.01% (October) after spawning. The gonadosomatic index, gonad weight, and spawning were related to the seawater temperature. According to this study, the spawning period of H.polii at the eastern coasts of the Aegean Sea starts in July and completely ends in October. As a result, the data related to the reproduction biology in spawning period of H.polii would guide stock management and artificial breeding of this species under controlled conditions.

Biometric analysis of moustached thryssa Thryssa mystax (Bloch and Schneider, 1801) along the Ratnagiri coast of Maharashtra, India

2020 ◽  
Vol 67 (2) ◽  
Author(s):  
D. R. Kende ◽  
V. H. Nirmale ◽  
U. R. Gurjar ◽  
U. Qayoom ◽  
N. Syed ◽  
...  
Keyword(s):  
Fork Length ◽  
Moderate Degree ◽  
Morphometric Characters ◽  
Biometric Analysis ◽  
Coefficient Of Correlation ◽  
Pooled Data ◽  
Weight Relationship ◽  
Total Length ◽  
Relationship Of

The moustached thryssa Thryssa mystax (Bloch and Schneider, 1801), is an important bycatch landed by trawl nets and mini purse seines at Ratnagiri in Maharashtra. Morphometric characters and length-weight relationship of the moustached thryssa were studied from 876 specimens comprising of 436 males, 407 females and 33 indeterminates, collected from Ratnagiri. The coefficient of correlation of total length against other morphometric characters of T. mystax ranged between 0.3967 (against pre-pelvic length) to 0.9966 (against fork length). All morphometric measures had a high and moderate degree of correlation with total length. The length-weight relationship indicated isometric growth. The coefficient of correlation (r) for the length-weight relationship was estimated at 0.9327, 0.9266, 0.9743 and 0.9379 for the males, females, indeterminants and pooled data, respectively.

scholarly journals Morphoregression and length-weight relationship of Bali sardinella, Sardinella lemuru Bleeker 1853 in Bali Strait Waters

2019 ◽  
Vol 18 (3) ◽  
pp. 275
Author(s):  
Nyoman Dati Pertami ◽  
M.F. Rahardjo ◽  
Ario Damar ◽  
I.W. Nurjaya
Keyword(s):  
Standard Length ◽  
Average Length ◽  
Economic Value ◽  
Fork Length ◽  
Growth Patterns ◽  
Length Measurement ◽  
Weight Relationship ◽  
Total Length ◽  
Relationship Of ◽  
The Relationship

Bali Sardinella, Sardinella lemuru Bleeker 1853, included in small pelagic groups which have an important economic value. The production of Bali Sardinella was the highest among the other small pelagic fish in Bali Strait waters. The morphoregression and length-weight relationship are important to be known to facilitate the conversion between a length measurement to another type of length measurement and the weight. The aims of this research were to reveal the relationship between total length (TL) and standard length (SL), total length and fork length (FL), fork length and standard length, and the length-weight. The research was held in Bali Strait waters from March 2017 – Mei 2018. The morphoregression was analyzed using simple linear regression, whereas the length-weight relationship using power regression. A total of 470 individuals of Bali sardinella were collected during the study period. The fish that analyzed have a length range 9.7 –20.2 cm TL. The average length of Bali sardinella was13.7 cm. The relationship between total length (TL) and standard length (SL); total length (TL) and fork length (FL); fork length (FL) and standard length (SL) for Bali sardinella respectively were TL = 1.1038SL + 0.9313; TL = 1.0861FL + 0.2967; and FL = 1.0068SL + 0.6936, respectively. The value of b which were generated from the length-weight relationship of Bali Sardinella was 3.22 with the growth patterns were positive allometric.AbstrakIkan lemuru, Sardinella lemuru Bleeker 1853, termasuk dalam kelompok ikan pelagis kecil yang bernilai ekonomis tinggi. Dibandingkan dengan jenis pelagis kecil lainnya, hasil tangkapan ikan lemuru  lebih dominan di perairan Selat Bali. Persamaan morforegresi dan hubungan panjang bobot penting untuk diketahui sehingga mudah melakukan kon-versi dari satu jenis panjang ke jenis panjang lain dan bobotnya. Penelitian ini bertujuan untuk mengungkap hubungan antara panjang total (PT) dengan panjang baku (PB), panjang total dengan panjang cagak (PC), panjang cagak dengan panjang baku, serta hubungan panjang bobot ikan lemuru. Penelitian dilaksanakan di perairan Selat Bali kurun waktu Maret 2017 – Mei 2018. Morforegresi dianalisis menggunakan regresi linear sederhana, sedangkan hubungan panjang bobot dianalisis menggunakan regresi power. Ikan lemuru (Sardinella lemuru Bleeker 1853) yang dikumpulkan selama penelitian berjumlah 470 ekor. Ikan yang dianalisis memiliki kisaran panjang antara 9,7 – 20,2 cm PT. Panjang rata-rata ikan lemuru adalah 13,7 cm. Hubungan antara panjang total (PT) dan panjang baku (PB); panjang total (PT) dan pan-jang cagak (PC); panjang cagak (PC) dan panjang baku (PB) ikan lemuru secara berturut-turut adalah PT = 1,1038 PB + 0,9313; PT = 1,0861 PC + 0,2967; and PC = 1,0068 PB + 0,6936. Nilai b yang terbentuk pada hubungan panjang bobot ikan lemuru adalah 3,22  dengan pola pertumbuhan adalah allometrik positif.

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