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Tilapias are one of the world's most productive and internationally traded foods. It was brought to tropical and subtropical regions for aquaculture purposes to it that spread quickly. The aquaculture sector in Turkey as well as in the rest of the world, it is one of the most important reasons for the spread of invasive species. Three specimens, was collected via gill net during a survey carried out in Iskenderun coast on June and August 2016. The fish samples were 12.4 cm, 20.0 and 21.4 cm in total length (TL) and 36.0 g, 120.0 and 212.0 g total weight (TW), respectively. In this study, Oreochromis niloticus were recorded for the first time in Akgöl (Mersin). It is though that this species was brought to Akgöl (Mersin) for aquaculture and later adapted here.

A single specimen white seabream, Diplodus sargus (Linnaeus, 1758), was recorded on 11 November 2019 from the coast of Konacık (Arsuz) in the Iskenderun Bay (North-eastern Mediterranean, Turkey). This specimen was identified as a specimen of Diplodus sargus. Known as Xanthochromism, abnormal skin coloration is an unusually yellow pigmentation in fishes. It is often associated with the lack of usual red pigmentation and its replacement with yellow. The present paper reported the first occurrence of the xanthochromic specimen of Diplodus sargus from Turkey's Mediterranean coast.

In the study, it was aimed to determine the morphometric measurements of Siganus rivulatus (Forsskål & Niebuhr, 1775) sampled from Mersin Bay in February 2021. The average value of some morphometric measurements of fish from Mersin Bay (n=196) were found that the total length 17.87 ± 3.11 cm, standard length 13.88 ± 1.96 cm, fork length 17.06 ± 1.35 cm, head length 3.60 ± 0.76 cm, eye diameter 1.08 ± 0.23 cm, interorbital distance 1.60 ± 0.34 cm, body width 2.32 ± 0.48 cm, dorsal fin base length 10.45 ± 2.19 cm, anal fin base length 6.26 ± 1.31 cm, pectoral fin length 2.56 ± 0.53 cm and caudal peduncle height 0.78 ± 0.16 cm. The total length-weight relationship of the species was determined as W = 0.0004xTL4.197 (r2=0.973) and it was found that fish showed positive allometric growth.

In June 2018, a single female specimen of the Ocean sunfish, Mola mola (Linnaeus, 1758) (122 cm in total length and 80 kg in weight) was caught by a commercial trammel net at a depth of 393 m in Mersin Bay (Bozyazı coast), Turkey. This paper presents the first substantiated occurrence and hence, the confirmation of M. mola in the Northeastern Mediterranean, Turkey. Morphological and meristic measurements of the specimen were made and recorded with the catalog number MEUFC-18-11-101 in the Museum of the Systematic in, Mersin University’s Faculty of Fisheries. Morphometric and mer-istic data matched other recordings of this species from parts of the Mediterranean, and the histor-ical captured record of the species in the Mediterranean was documented.

A young individual of Isurus oxyrinchus was caught by a commercial longline off Dana Island (Mersin Bay, northeastern Mediterranean Sea) at a depth of 72 m on May 18th 2020. Morphometric measurements of the specimen were recorded and its photographs were taken. The examined specimen is now being preserved in the Museum of Systematics at Faculty of Fisheries of Mersin University, under the reference number MEUFC-20-11-132. This occurrence of a young female specimen reported in this study is adding a new location (Mersin Bay) from the Mediterranean's Turkish waters., Isurus oxyrinchus'un genç bir bireyi, 18 Mayıs 2020 tarihinde Dana Adası açıklarında (Mersin Körfezi, Kuzeydoğu Akdeniz) 72 m derinlikte ticari balıkçılık sırasında pareketa ile yakalanmıştır. Örneğin morfometrik ölçümleri kaydedildi ve fotoğrafları çekildi. İncelenen örnek şu anda Mersin Üniversitesi Su Ürünleri Fakültesi Sistematik Müzesi'nde MEUFC-20-11-132 örnek numarasıyla muhafaza edilmektedir. I. oxyrinchus'un Doğu Akdeniz ve Türkiye sularında nadir görüldüğü aşikardır. Bu çalışmada bildirilen genç bir dişi bireyin bu bölgedeki varlığı Türkiye’nin Akdeniz sularına yeni bir lokalite (Mersin Körfezi) eklemektir.

One individual of Polyprion americanus (Bloch & Schneider, 1801) was captured by a bottom longline from Arsuz coast, Iskenderun Bay at depth of 22 m on 14 June 2015 and another individual was caught by trammel net from Yeşilovacık coast, Mersin Bay at a depth of about 30 m on 01 June 2017. Reporting two juvenile specimens, this paper confirms the occurrence of this species in Iskenderun and Mersin Bays (Eastern Mediterranean coast of Turkey) in addition to previous reports from the Mediterranean Sea. Besides, this report is the first observation for these locations and fills a gap in the distribution range of the species. All measurements and counts, as well as morphological and color descriptions of juvenile individuals of P. americanus, are given.

Büyükeceli kıyılarında (Kuzey-Doğu Akdeniz) 400 m derinlikte bir trol teknesi ile dişi bir Centrolophusniger (Gmelin, 1789) bireyi avlanmıştır. Bu bireyin boyu 51,9 cm bulunmuştur. Bu çalışma Türkiye’nin Akdenizve Ege sahilleri boyunca beşinci lokalite kaydı verilmiş ve aynı zamanda Türkiye’nin Büyükeceli Akdenizkıyısından bu türün ilk kez varlığı rapor edilmiştir., A female rudderfish, Centrolophus niger (Gmelin, 1789) was caught by a trawler boat at a depth of400 m on the shores of the Büyükeceli (Northeastern Mediterranean Sea). Its total length was 51.9 cm. Thispaper reports the fifth location along the Mediterranean and Aegean Sea coast of Turkey and the presence of thespecies in the Büyükeceli coast from the Mediterranean coast of Turkey

Remoras attach to sharks, big fish, and sea turtles and continue their lives with these creatures. Kapızlı and Tekeli beaches are located near Göksu Delta and Anamur nesting areas of Caretta caretta. In this study, two Remora individuals were caught with a fishing rod in July, when the ovulation was most intense. The smaller remora individual (33 cm) was caught from the coast of Tekeli with the chicken breast at a depth of 2.5 m, and the larger one (66 cm) with bread at a depth of 1.5 m from Kapızlı beach on 24.07.2020. The two Remora individuals caught were probably attached to the sea turtles. However, probably due to sea turtles going to the beach to lay eggs, Remoras started to free-swimming, and they were caught with the fishing line since they could not be fed. The present study reported that the first occurrence of Remora specimens is probably attached to turtles for Turkey's northeastern Mediterranean coast. Besides, this study is provided some morphometric and meristic data on this species and discussed a probable host of these specimens.

The length-weight relationships (LWRs) of fish are helpful in fisheries science. A total of 504 yellowspotted puffer (Torquigener flavimaculosus) specimens (257 female and 247 male) were caught from the Yumurtalık coast of Turkey (Eastern Mediterranean Sea) between 2018 and 2019 by using a trammel net set with a depth range between 5 and 42 m. The sex ratio was found 1:1.08 for males and females, respectively. The length-weight relationship was described for combined both sexes by the following formula W = 0.00130×L3.094 (r2 = 0.918) with a positive allometric growth. Fulton condition factor (CF) was calculated as 1.713 ± 0.145 for combined sexes. This study presents the first results available for the length-weight relationships and condition factor of T. flavimaculosus according to both sexes in the Yumurtalık coast of Turkey.

In the present study, length–weight relationships (LWRs) were estimated for three deep sea fish species, namely, Nettastoma melanura Rafinesque, 1810; Lampanyctus crocodilus (Risso, 1810); and Chauliodus sloani Bloch & Schneider, 1801 in the north-eastern Mediterranean Sea. A total of 102 fish samples were collected from Mersin Bay (Erdemli coast). Their length–weight relationship b values ranged between 2.458 and 3.496, and all regressions were found to be significant for all three species (p