Tyrone Pacific International (Tyrone), a shipper, brought suit in federal admiralty jurisdiction against its carrier, Ta Peng Steamship Co. (Ta Peng), the vessel Eurychili, and Ta Peng’s local agent, Furness Interocean Corporation (Furness). Ta Peng is now defunct, and a default judgment entered against it is apparently uncollectible. The vessel was never served. Only Tyrone and Furness are now before this court. The District Court for the Northern District of California entered judgment pursuant to the report of the Magistrate to the effect that, although Furness had violated 46 U.S.C. § 193 and was liable for a statutory penalty under 46 U.S.C. § 194 , 1 Tyrone’s claim for additional damages was without merit. Furness did not appeal the judgment entered against it, but Tyrone appeals the denial of its damage claim.

Tyrone booked about 1200 metric tons of cargo for shipment aboard Ta Peng’s vessel, *666 the Eurychili, from Richmond, California to Kaohsiung on Taiwan. While the cargo was being loaded, a dispute arose concerning the amount of space that would be allocated to carry it. After about 748 metric tons had been loaded, the shipmaster refused to take more below decks. Tyrone declined to allow its remaining cargo to be stored on deck, and the vessel sailed carrying only the 748 tons.

Under the terms of the contract, freight on the cargo was to be paid two days after bills of lading were issued. The magistrate found that all parties concerned had contemplated that Furness would issue the bills as Ta Peng’s agent. However, after the ship sailed, Ta Peng instructed Furness not to issue any bills of lading until Tyrone paid “dead freight,” i. e., the full amount of freight that would have been due had the entire 1200 metric tons of cargo been shipped. When Tyrone demanded bills of lading on the 748 metric tons shipped, it was met with Ta Peng’s demand. Tyrone disputed its liability for dead freight, but in the face of Furness’ refusal to issue any bills without such payment, Tyrone paid the full amount. Furness then issued the bills.

Tyrone claims that Ta Peng had no right to extract dead freight payments and that it is entitled to reimbursement. Frustrated in its efforts to recover from Ta Peng, it seeks to hold Ta Peng's agent liable. Tyrone argues that Furness “converted” the bills of lading when, on behalf of Ta Peng, it withheld the bills against payment of money that Ta Peng had no right to demand.

The elements of the tort of conversion are well settled in California:

Hartford Financial Corp. v. Burns, 96 Cal.App.3d 591, 598 , 158 Cal.Rptr. 169 (1979). “Conversion” has been defined as “any act of dominion wrongfully exerted over another’s personal property in denial of or inconsistent with his rights therein.” Id.

Tyrone makes a plausible case with regard to the first two elements of the tort. Furness undoubtedly had a legal duty to issue bills of lading to Tyrone, 46 U.S.C. § 193 , and its refusal to do so was, as the district court found, a wrongful act of dominion over Tyrone’s property.

Nonetheless, Tyrone cannot fit its quarrel with Furness into the conversion mold because it cannot establish an entitlement to conversion damages. California Civil Code § 3336 provides:

Interpretations of this section by the California courts have tracked the traditional common law conception of conversion as a forced sale. Thus, the courts have determined that:

Myers v. Stephens, 233 Cal.App.2d 104, 116 , 43 Cal.Rptr. 420 (1965). Even when applying the alternative provision, the courts look to the value of the property as the measure of damages, calculating it on a different basis where justice demands. Thus, for example, a court awarded the value of the converted property at a time after the conversion where it found that the *667 owner had taken pains to avoid selling at the time of conversion in anticipation of a later increase in value. Betzer v. Olney, 14 Cal.App.2d 53, 61 , 57 P.2d 1376 (1936). The alternative measure might also be appropriate where the owner has voluntarily accepted return of his property, but its value has declined as a result of the conversion. In such a case, award of the full value of the property would be unfair to the defendant; instead, he would be ordered to restore to the owner the amount by which the value has declined. See W. Prosser, The Law of Torts 97 (4th ed. 1971).

Tyrone argues that it is entitled to recover the dead freight charges under this second conversion damage measure. However, this argument entirely ignores the fact that conversion damages are based on the value of the converted property, and the fact that the dead freight charges were not related in any way to the value of the bills of lading. The magistrate correctly determined that award of the dead freight charges would be inappropriate in a conversion action. The magistrate was also correct in his determination that Tyrone can take nothing under proper conversion damage measures. There was no evidence that the value of the bills declined during their detention by Furness; neither was there evidence that Tyrone’s inability to transfer bills of lading on the cargo caused it to lose an opportunity to sell the cargo during that period. Hence, Tyrone suffered no damages cognizable in this action. It therefore failed to establish the third element of the tort, and its claim for damages was properly denied.

Tyrone has suggested to this court that 46 U.S.C. §§ 193 , 194 and 1303 create an implied private right of action independent of the common law conversion remedy. The district court’s order of remand invited Tyrone to make this argument before the magistrate; however, Tyrone never did so. Instead, it took the distinct position that the federal statutes create a legal duty, violation of which could give rise to the tort of conversion. Ordinarily, appellate courts should not consider issues not presented to the district court. Singleton v. Wulff, 428 U.S. 106, 120 , 96 S.Ct. 2868, 2877 , 49 L.Ed.2d 826 (1976); Hormel v. Helvering, 312 U.S. 552, 553, 556 , 61 S.Ct. 719, 721 , 85 L.Ed. 1037 (1941). In view of Tyrone’s very superficial argument on the issue here, we see no reason to depart from this rule.

Accordingly, the judgment of the district court is AFFIRMED.

. Section 193 provides:

Section 194 provides: