Comparative gonadogenesis and hormonal induction of spawning of cultured and wild mediterranean amberjack (<i>Seriola dumerili</i>, Risso 1810)

Abstract

SUMMARY: The histological characteristics of wild and cultured Mediterranean amberjack gonads were studied during the first four years of their life cycle. No differences were found in the gonad development of both wild and captive males and females during the first and second year. In the third year, wild females showed more advanced oocyte development than captive females. In the fourth year, vitellogenic oocytes were noted for captive females. Fertilised eggs were obtained after a HCG hormone treatment of four-to nine-year old wild specimens. A smaller quantity of mature and fertilised eggs was also obtained through the spawning of hormone-treated four-year old captive broodstock specimens. Eggs in the stage of gastrulation died within eight hours following fertilisation.

Comparative Study of Reproductive Development in Wild and Captive-Reared Greater Amberjack Seriola dumerili (Risso, 1810)

“…However, large migratory, top predator fish do no adapt easily to captivity and when confined in sea cages or tanks they may exhibit important reproductive dysfunctions [11, 18–21]. Some of the reproductive dysfunctions of captive-reared greater amberjack have been overcome occasionally through the administration of exogenous reproductive hormones, such as human chorionic gonadotropin (hCG) [22–24] or gonadotropin releasing hormone agonists (GnRHa) [22, 23, 25, 26], while the occurrence of spontaneous spawning has been reported rarely [12]. However, the absence of a significant aquaculture industry for greater amberjack in Europe is testament to the lack of a reliable technology for broodstock management and reproduction control in captivity for this species [26].…”

“…Different studies have been carried out in the Mediterranean Sea to investigate gametogenesis and describe the reproductive cycle either in wild [10, 28–30] or captive-reared greater amberjack [18, 24, 26]. However, so far no comparative study of the reproductive function of wild vs captive-reared greater amberjack has been conducted, in order to identify the extent and the points at which possible reproductive impairments occur in captivity.…”

Gonadal development and associated changes in gonadosomatic index and sex steroids during the reproductive cycle of cultured male and female Caspian brown trout,Salmo trutta caspius(Kessler, 1877)

“…It is now clearly established that there is an inhibitory effect of stress on reproductive processes in teleost fishes, with effects ranging from depression of endocrine function to reduction of gamete and larval quality (Pankhurst and Van Der Kraak 1997). Several researchers have investigated fish maturation by histological and hormonal observations in the cultural environment to the evaluation of the efficiency of reproduction (Matsuyama et al 1991;Kozul et al 2001;Dahle et al 2003). Dahle et al (2003) investigated the gonadal development and associated changes in sex steroids during the reproductive cycle of captive Atlantic cod, Gadus morhua L. Histological observations in Red porgy, Pagrus pagrus presented a good background of reproductive cycle from a multiple spawner species (Kokokiris et al 2000).…”

Skeletal Development and Mineralization Pattern of the Vertebral Column, Dorsal, Anal and Caudal Fin Complex in Seriola Rivoliana (Valenciennes, 1833) Larvae

“…Bone description, followed the terminology suggested by different authors [41][42][43], and their abbreviations, and are illustrated in the Table 1. The angles of the spine from the surface to internal bone layers (Figures 2A and 2B), whereas in the haemal (with Hs) and caudal region (Ns and Hs modified to support caudal fin complex) the mineralization pattern proceeds in both directions dorsal and ventrally (Ce [11][12][13][14][15][16][17][18][19][20][21] and Ce 22-23 respectively), joining in the middle of the centra ( Figure 2C). Exceptionally, in Ce 9 and Ce 10 , the mineralization of the vertebral bodies differed from other vertebral structures of the prehaemal region, proceeding dorsally first and ventrally later on.…”

“…Even though S. rivoliana is commercially produced [3], studies about its biology are scarce and only few reports on larval rearing have been conducted in Ecuador [4][5][6], Hawaii [7] and more recently in the Canary Islands [8]. In contrast, numerous studies of the genus Seriola have been published related to the feeding requirements and nutrition [9][10][11][12][13][14][15][16][17], reproduction biology [2,[18][19][20][21] and culture needs [8,[22][23][24][25][26].…”