Sperm production is a crucial factor for the potential reproductive success of males in many species (Nakatsuru & Kramer, 1982). Especially under strong sperm competition, higher sperm numbers in the ejaculates are likely to increase a male’s chance of fertilization (Parker et al., 1996). But sperm production is limited by physiological constraints, e.g. by testis size, which often depends on t...

Perkembangan pada sektor usaha berskala besar hingga skala kecil di Indonesia mulai terlihat perkembangannya. Salah satunya yaitu UMKM yang memanfaatkan limbah kain perca. Dalam menjalankan usahanya, tak jarang pelaku mengalami hambatan seperti sulitnya mencari Berdasarkan masalah muncul, e-commerce menjadi salah satu jawaban alternatif guna mewadahi penjualan Keuntungan dari pemanfaatan bagi d...

Untuk memperoleh hasil pressing Busana Custom Made yang rapi, licin, dan halus pada umumnya menggunakan seam roll tailor’s ham, namun karena harganya relatif mahal menjadikan alat tersebut tidak terbeli. Oleh itu, dilakukan inovasi untuk membuat Alja Talingcagra (alat pelajaran bantal, guling, perca, grajen kayu jati). adalah sebuah peralatan berbentuk bantal guling kecil terbuat dari perca jat...

Total length, body mass and gut content mass of young-of-the-year (YOY) perch Perca fluviatilis, dace Leuciscus leuciscus and bleak Alburnus alburnus were recorded over the summer of 2006 at three littoral sites at Upper Lake Constance. In P. fluviatilis and L. leuciscus, gut content mass correlated positively with wave-induced energy flux (E(F)) of the respective site and sampling day, while n...

In enclosure experiments in the littoral zone of Lake Constance, Germany, juvenile cyprinids showed significantly reduced somatic growth in the shallow eulittoral zone (0 5 m depth) compared to the sublittoral zone (1 6 m depth). Growth was especially reduced in larger and more deep-bodied fish groups, providing evidence that this is due to increased hydrodynamic stress, induced by ship and win...

Rapporttyp Report category Licentiatavhandling x Examensarbete C-uppsats D-uppsats Övrig rapport _______________ Språk Language Svenska/Swedish x Engelska/English ________________ Titel Title Selective predation by perch (Perca fluviatilis) on a freshwater isopod, in two macrophyte substrates Författare Author Magnus Andersson Sammanfattning Abstract Recent studies show that populations of the ...

Cells of the gas gland of the perch Perca fluviatilis L., stimulated to increased generation of gas by the repeated emptying of the swim-bladder, were examined in the electron microscope. Intense activity of the nuclear envelope was demonstrated. Simple vesicles originating from the external nuclear membrane and the so-called multivesicular bodies derived from the outpocketings of both membrane...